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The problem is ... one of the data structure sub fields value gets changed automatically to some arbitrary value with out having to do anything the program.
It sounds like a parameter length mis-match. Check every parameter list of the programs that call this one, and all the parameter lists of the programs this one calls and verify they are all correct.
If there is a mis-match, something as simple as a CHAIN can inadvertently overlay data that your program does not own.
--buck
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