INFORMIX 4.1 to INFORMIX 7.X migration issues

Dear all, We have currently the following informix setup : INFORMIX EMBEDDED SQL for C Version 7.10.UC1 Copyright (C) 1984-1994 Informix Software, Inc. INFORMIX-4GL Version 6.01.UD2 Copyright (C) 1984-1994 Informix Software, Inc. INFORMIX-SQL Version 6.01.UD1 Copyright (C) 1984-1994 Informix Software, Inc. INFORMIX-OnLine Dynamic Server Version 7.13.UC3 Copyright (C) 1986-1996 Informix Software, Inc In addition to this we have an OS HP-UX hotsy A.09.04 E 9000/867 445345261 8-user license which is running on an H40 machine. We have ported a product from Informix 4.1 to the above configuration but we are getting runtime errors. eg. While fetching an a column from the database fetches a null value. When we display a form after a fresh entry is inserted into the database the software gives "BUS ERROR " in one of the informix routines. When we display some information from the table to a forms gives runtime erorr (-404 Cursor not defined ). I would be highly obliged if any one could gives us a clue on this problems. Awaiting a reply. Thanks to you all in advance Siva sudupa@telesciences.com