COMPUTRON SOFTWARE INC
SC 13G/A, 1999-02-12
PREPACKAGED SOFTWARE
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<PAGE>   1
                                                  
                                                       -------------------------
                                                             OMB APPROVAL
                                                       -------------------------
                                UNITED STATES          OMB Number:  3235-0145
                  SECURITIES AND EXCHANGE COMMISSION   Expires: August 31, 1999
                            WASHINGTON, D.C. 20549     Estimated average burden
                                                       hours per response. 14.90
                                                       -------------------------
                                 SCHEDULE 13G
                                      
                                      
                  Under the Securities Exchange Act of 1934
                             (AMENDMENT NO. THREE)*


                            Computron Software, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   205631104
                                --------------
                                (CUSIP Number)
                                       

                               December 31, 1998 
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ ] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[X] Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


SEC 1745 (3-98)                Page 1 of 23 pages

<PAGE>   2
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  2  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Canaan Capital Limited Partnership
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       Delaware Limited Partnership
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 345,646
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    2,884,715
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            345,646
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            2,884,715
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       PN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 23 pages
<PAGE>   3
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  3  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Canaan Capital Offshore Limited Partnership, C.V.
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       Netherland Antilles Limited Partnership
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 2,884,715
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    345,646
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            2,884,715
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            345,646
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       PN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 3 of 23 pages
<PAGE>   4
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  4  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Canaan Capital Management L.P.
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       Delaware Limited Partnership
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       PN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 4 of 23 pages
<PAGE>   5

- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  5  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Canaan Capital Offshore Management, N.V.
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       Netherlands Antilles Corporation
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    2,884,715
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            2,884,715
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       2,884,715
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       12.1%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       CO
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 5 of 23 pages
<PAGE>   6
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  6  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Canaan Capital Partners L.P.
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       Delaware Limited Partnership
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0       
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0        
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       PN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 6 of 23 pages
<PAGE>   7
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  7  OF 23  PAGES
- --------------------                                      ---------------------
                                
- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Harry T. Rein
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 7 of 23 pages
<PAGE>   8
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  8  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       James J. Fitzpatrick
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 8 of 23 pages
<PAGE>   9
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE  9  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Stephen L. Green
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0       
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0         
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 9 of 23 pages
<PAGE>   10
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE 10  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Deepak Kamra
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0        
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 10 of 23 pages
<PAGE>   11
- --------------------                                      ---------------------
CUSIP NO.  205631104               13G                    PAGE 11  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Gregory Kopchinsky
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 26,500       
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            26,500       
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,256,861
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.7%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 11 of 23 pages
<PAGE>   12
- --------------------                                      ---------------------
CUSIP NO.  205631104             13G                      PAGE 12  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Robert Migliorino
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 22,500            
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            22,500       
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,252,861
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.7%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 12 of 23 pages
<PAGE>   13
- --------------------                                      ---------------------
CUSIP NO.  205631104                13G                   PAGE 13  OF 23  PAGES
- --------------------                                      ---------------------

- -------------------------------------------------------------------------------
  (1)  NAMES OF REPORTING PERSONS
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

       Eric A. Young
- -------------------------------------------------------------------------------
  (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a) [ ]
                                                                (b) [ ]

- ------------------------------------------------------------------------------- 
  (3)  SEC USE ONLY

- -------------------------------------------------------------------------------
  (4)  CITIZENSHIP OR PLACE OF ORGANIZATION                          

       United States
- -------------------------------------------------------------------------------
                       (5)  SOLE VOTING POWER                       
                            
  NUMBER OF                 0
   SHARES             ---------------------------------------------------------
 BENEFICIALLY          (6)  SHARED VOTING POWER       
  OWNED BY
    EACH                    3,230,361
  REPORTING           ---------------------------------------------------------
 PERSON WITH           (7)  SOLE DISPOSITIVE POWER
            
                            0         
                      ---------------------------------------------------------
                       (8)  SHARED DISPOSITIVE POWER                

                            3,230,361
- -------------------------------------------------------------------------------
  (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON  
                                                      
       3,230,361
- -------------------------------------------------------------------------------
 (10)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                              [ ]

- -------------------------------------------------------------------------------
 (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9               

       13.6%
- -------------------------------------------------------------------------------
 (12)  TYPE OF REPORTING PERSON*  

       IN
- -------------------------------------------------------------------------------

                    *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 13 of 23 pages
<PAGE>   14
Item 1(a). NAME OF ISSUER

           Computron Software, Inc.

Item 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

           301 Route 17 North, 12th Floor
           Rutherford, NJ  07070

Item 2(a). NAME OF PERSON FILING

           This statement is filed by Canaan Capital Limited Partnership, a
           Delaware limited partnership, ("Canaan Capital"), Canaan Capital
           Offshore Limited Partnership C.V., a Netherlands Antilles limited
           partnership, ("Canaan Capital Offshore"), Canaan Capital Management
           L.P. , a Delaware limited partnership, ("Canaan Capital Management"),
           Canaan Capital Offshore Management, N.V., a Netherlands Antilles
           corporation ("Canaan Corporation"), Canaan Capital Partners L.P., a
           Delaware limited partnership, ("Canaan Partners") and Harry T. Rein,
           James J. Fitzpatrick, Deepak Kamra, Stephen L. Green, Gregory
           Kopchinsky, Robert J. Migliorino, and Eric A. Young (collectively,
           the "Partners"). Canaan Capital Management (which serves as the sole
           general partner of Canaan Capital and one of the two general partners
           of Canaan Capital Offshore), Canaan Corporation (which serves as the
           other general partner of Canaan Capital Offshore), Canaan Partners
           (which serves as the general partner of Canaan Capital Management),
           and the Partners (who serve as general partners of Canaan Partners),
           are collectively referred to as the "Reporting Persons" in this
           Schedule 13G.

Item 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE

           Except in the case of Canaan Capital Offshore, Canaan Corporation,
           Deepak Kamra and Eric A. Young, the principal business address of the
           Reporting Persons is 105 Rowayton Avenue, Rowayton, CT 06853. The
           principal address of Canaan Capital Offshore and Canaan Corporation
           is c/o ABN Trustcompany, Pietermaai 15, Curacao, the Netherlands
           Antilles. The principal business address of Deepak Kamra and Eric A.
           Young is 2884 Sand Hill Road, Suite 115, Menlo Park, CA 94025.

Item 2(c). CITIZENSHIP

           Each of Canaan Capital, Canaan Capital Management and Canaan Partners
           is a limited partnership organized under the laws of Delaware. Canaan
           Capital Offshore is a limited partnership and Canaan Corporation is a
           corporation, each organized under the laws of the Netherlands
           Antilles. Each of the Partners are citizens of the United States.


                              Page 14 of 23 pages
<PAGE>   15



Item 2(d).        TITLE OF CLASS OF SECURITIES

                  This Schedule 13G report relates to the Common Stock, par
                  value $.01 ("Common Stock") of Computron Software, Inc. ("the
                  Company").

Item 2(e).        CUSIP NUMBER

                  CUSIP number 205631104.

Item 3.    IF THIS STATEMENT IF FILED PURSUANT TO RULES 13D-1(b), OR 13D-2(b),
           CHECK WHETHER THE PERSON FILING IS A:
           None.

Item 4.    OWNERSHIP

(a)        Canaan Capital owns 345,646 shares of Common Stock and Canaan Capital
           Offshore owns 2,884,715 shares of Common Stock. All other Reporting
           Persons hold their respective beneficially owned shares due to their
           relationships to the above Partnerships as outlined in Item 2. In
           addition, Mr. Kopchinsky owns 4,000 shares of Common Stock and
           options to purchase 7,500 shares of Common Stock at $1.00 per share
           and options to purchase 15,000 shares of Common Stock at $1.63 per
           share as an individual. Mr. Migliorino owns options to purchase 7,500
           shares of Common Stock at $1.00 per share and options to purchase
           15,000 shares of Common Stock at $1.63 per share as an individual.

(b)        By virtue of their common control, Canaan Capital and Canaan Capital
           Offshore each may be deemed to be the beneficial owners of 3,230,361
           shares of Common Stock, representing beneficial ownership of 13.6% of
           the Company. Canaan Capital Management, by virtue of its status as
           general partner of Canaan Capital and Canaan Capital Offshore, may be
           deemed to be the beneficial owner of 3,230,361 shares, representing
           beneficial ownership of 13.6%. Canaan Corporation, by virtue of its
           status as a general partner of Canaan Capital Offshore, may be deemed
           to be the beneficial owner of 2,884,715 shares, representing
           beneficial ownership of 12.1%. By virtue of its status as general
           partner of Canaan Capital Management, Canaan Partners may be deemed
           to be the beneficial owner of 3,230,361 shares, representing
           beneficial ownership of 13.6%. By virtue of their status as general
           partners of Canaan Partners, the Partners may each be deemed to be
           the beneficial owner of 3,230,361 shares representing in the case of
           each Partner, beneficial ownership of 13.6%. In addition, Messrs.
           Kopchinsky and Migliorino own additional shares as outlined in (a)
           above which increases their respective percentage of ownership to
           13.7%. The foregoing percentages are calculated based on the
           23,794,355 shares of Common Stock reported to be outstanding in the
           Quarterly Report on Form 10-Q of the Issuer for the quarter ended
           September 30, 1998.



                              Page 15 of 23 pages
<PAGE>   16


<TABLE>
<CAPTION>

                                                          NUMBER OF SHARES
                                    ----------------------------------------------------------------
(c)  Reporting Person                   (i)              (ii)              (iii)             (iv)
     ----------------               ----------         ---------         ---------        ----------
<S>                                    <C>             <C>                 <C>             <C>      
Canaan Capital                         345,646         2,884,715           345,646         2,884,715
Canaan Capital Offshore              2,884,715           345,646         2,884,715           345,646
Canaan Capital Management                    0         3,230,361                 0         3,230,361
Canaan Corporation                           0         2,884,715                 0         2,884,715
Canaan Partners                              0         3,230,361                 0         3,230,361
Harry T. Rein                                0         3,230,361                 0         3,230,361
James J. Fitzpatrick                         0         3,230,361                 0         3,230,361
Stephen L. Green                             0         3,230,361                 0         3,230,361
Deepak Kamra                                 0         3,230,361                 0         3,230,361
Gregory Kopchinsky                      26,500         3,230,361            26,500         3,230,361
Robert J. Migliorino                    22,500         3,230,361            22,500         3,230,361
Eric A. Young                                0         3,230,361                 0         3,230,361
</TABLE>


(i)        Sole power to vote or direct the vote 
(ii)       Shared power to vote or to direct the vote 
(iii)      Sole power to dispose or to direct the disposition of 
(iv)       Shared power to dispose or to direct the disposition of

Item 5.    OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
           Not applicable.

Item 6.    OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
           Not applicable.

Item 7.    IDENTIFICATION  AND  CLASSIFICATION  OF THE SUBSIDIARY WHICH ACQUIRED
           THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
           Not applicable.

Item 8.    IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
           Each of the Reporting Persons expressly disclaims membership in a
           "Group" as defined in Rule 13d-1 (b) (ii) (J).

Item 9.    NOTICE OF DISSOLUTION OF GROUP
           Not applicable.

Item 10.   CERTIFICATION
           Not applicable. This Schedule 13G is not filed pursuant to Rule
           13d-1(b).


DATE:  February 10, 1999

                              Page 16 of 23 pages
<PAGE>   17




                                   SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, each of the
undersigned certifies that the information set forth in this statement is true,
complete and correct.

Canaan Capital Limited Partnership
By:     Canaan Capital Management L. P.
        Its General Partner
By:     Canaan Capital Partners L.P.
        Its General Partner

By:               *        
        -----------------------------------                         
        General Partner


Canaan Capital Offshore Limited Partnership C. V.
By:     Canaan Capital Management L. P.
        Its General Partner
By:     Canaan Capital Partners L.P.
        Its General Partner

By:               *      
        ------------------------------------                            
        General Partner


Canaan Capital Management L. P.
By:     Canaan Capital Partners L.P.
        Its General Partner

By:               *         
        ------------------------------------                        
        General Partner


Canaan Capital Offshore Management, N.V.

By:               *    
        ------------------------------------                             
        Director


Canaan Capital Partners L.P.

By:               *      
        ------------------------------------                             
        General Partner


                              Page 17 of 23 pages
<PAGE>   18


                  *    
- -------------------------------------------- 
Harry T. Rein


                  *      
- --------------------------------------------
James J. Fitzpatrick


                  *   
- --------------------------------------------
Stephen L. Green


                  *    
- --------------------------------------------
Deepak Kamra


                  *       
- --------------------------------------------
Gregory Kopchinsky


                  * 
- --------------------------------------------
Robert J. Migliorino


                  *     
- --------------------------------------------
Eric A. Young


                                               *By: /s/ Guy M. Russo  
                                                    ---------------------------
                                                      Guy M. Russo
                                                      Attorney-in-Fact

- ----------------------------------------------------------------------------
This Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney a
copy of which is filed herewith as Exhibit 2.


                               Page 18 of 23 pages

<PAGE>   1


                                                                       Exhibit 1

                             JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
as amended, the undersigned agree that only one statement containing the
information required by Schedule 13G need be filed by each of the undersigned
with respect to the ownership by each of the undersigned of shares of stock of
Computron Software, Inc. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original.

Canaan Capital Limited Partnership
By:     Canaan Capital Management L. P.
        Its General Partner
By:     Canaan Capital Partners L.P.
        Its General Partner

By:               *       
        ------------------------------------                           
        General Partner


Canaan Capital Offshore Limited Partnership C. V.
By:     Canaan Capital Management L. P.
        Its General Partner
By:     Canaan Capital Partners L.P.
        Its General Partner

By:               *     
        -------------------------------------                             
        General Partner


Canaan Capital Management L. P.
By:     Canaan Capital Partners L.P.
        Its General Partner

By:               *  
        --------------------------------------                               
        General Partner


Canaan Capital Offshore Management, N.V.

By:               *  
        --------------------------------------                                
        Director


                               Page 19 of 23 pages
<PAGE>   2



Canaan Capital Partners L.P.

By:               *    
        ---------------------------------------
        General Partner


                  *    
- -----------------------------------------------
Harry T. Rein


                  *     
- -----------------------------------------------
James J. Fitzpatrick


                  *     
- -----------------------------------------------
Stephen L. Green


                  *     
- -----------------------------------------------         
Deepak Kamra


                  *      
- -----------------------------------------------
Gregory Kopchinsky


                  *     
- -----------------------------------------------
Robert J. Migliorino


                  *     
- -----------------------------------------------  
Eric A. Young


                                                 *By: /s/ Guy M. Russo   
                                                      -------------------------
                                                         Guy M. Russo
                                                         Attorney-in-Fact

- ----------------------------------------------------------------------------
This Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney a
copy of which is filed herewith as Exhibit 2.


                              Page 20 of 23 pages

<PAGE>   1


                                                                       EXHIBIT 2
                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Guy M. Russo his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities (until
revoked in writing) to sign any and all instruments, certificates and documents
required to be executed on behalf of himself as an individual or in his capacity
as a general partner or authorized signatory, as the case may be, on behalf of
any of Canaan Capital Limited Partnership; Canaan Capital Offshore Limited
Partnership C.V.; Canaan Capital Offshore Management, N.V.; Canaan Capital
Management L.P. or Canaan Capital Partners, L.P. pursuant to the Securities Act
of 1933, as amended, (the "Securities Act"), or the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and any and all regulations promulgated
thereunder and to file the same, with all exhibits thereto, and any other
documents in connection therewith, with the Securities and Exchange Commission,
and with any other entity when and if such is mandated by the Securities Act,
the Exchange Act or by the By-laws of the National Association of Securities
Dealers, Inc., granting unto said attorney-in-fact and agent full power and
authority to do and perform each and every act and thing requisite and necessary
fully to all intents and purposes as he might or could do in person thereby, and
ratifying and confirming all that said attorney-in-fact and agent, or his
substitute or substitutes, may lawfully do or cause to be done by virtue hereof,
or may have done in connection with the matters described above.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



                              Page 21 of 23 pages

<PAGE>   2




IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 29th day of
January, 1998.

CANAAN CAPITAL LIMITED PARTNERSHIP

By:  Canaan Capital Management, L.P.
     Its General Partner

By:  Canaan Capital Partners, L.P.
     Its General Partner

By:  /s/ Harry T. Rein    
     --------------------------------                         
     General Partner


CANAAN CAPITAL OFFSHORE LIMITED PARTNERSHIP C.V.

By:  Canaan Capital Management, L.P.
     Its General Partner

By:  Canaan Capital Partners, L.P.
     Its General Partner

By:  /s/ Harry T. Rein   
     --------------------------------                            
     General Partner


CANAAN CAPITAL OFFSHORE MANAGEMENT, N.V.

By:  /s/ Harry T. Rein   
     ---------------------------------                           
     Director


CANAAN CAPITAL MANAGEMENT, L.P.

By:  Canaan Capital Partners, L.P.
     Its General Partner

By:  /s/ Harry T. Rein   
     ---------------------------------                         
     General Partner


CANAAN CAPITAL PARTNERS, L.P.

By:  /s/ Harry T. Rein    
     ---------------------------------                        
     General Partner

                              Page 22 of 23 pages

<PAGE>   3


/s/ Harry T. Rein  
- --------------------------------------                               
Harry T. Rein


/s/ James J. Fitzpatrick   
- --------------------------------------                        
James J. Fitzpatrick


/s/ Stephen L. Green  
- --------------------------------------                             
Stephen L. Green


/s/ Deepak Kamra    
- --------------------------------------                               
Deepak Kamra


/s/ Gregory Kopchinsky   
- --------------------------------------                          
Gregory Kopchinsky


/s/ Robert J. Migliorino   
- --------------------------------------                        
Robert J. Migliorino


/s/ Eric A. Young  
- --------------------------------------                                
Eric A. Young





                              Page 23 of 23 pages























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