Are you able to make modifications to the VB exe's? If so, one thing I've found handy is to have all database actions and results that the EXE logged to a text file. You might find a deadlock or something that the VB exe isn't handling.

Failing that you could probably use Profiler to track what's going back and forth between the db and the exe.

Hope this helps

Phill Carter

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Colt 45 - the original point and click interface