>I found the issue. A PUBLIC variable was used in our main exe that is built from a small PRG that sets up general error handling and calls our MPR. The offending exe (called with the DO command in the MPR's procedure) also defined the same PUBLIC variable. I know that PUBLICs should be avoided but I have to pick my battles and we hardly have staff to fix syntax and run time bugs,...
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>Thanks for the APP tip. I like that a lot better.

You're welcome.