>It may not be a coding issue, but a DATA issue. I've seen this happen where a table is changed or, for the first time in forever, someone didn't enter the data in the field for gcProduct and the program can't handle it. Maybe the screen is supposed to pull the product codes from another table that didn't get loaded on the new machine, or the that table was set up incorrectly.
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>I would start by looking at your databases, then ensure that you are entering your test data the same way it is entered in production.

Problem solved/worked around.
It turned out the real error was that sysmetric(9) was not working under Win NT and Win 2000 which entered into an IF that had a code bug in it (FoxFire v2.5).