I think I’ve got it! Solution tracking seems to be associated with workstations, not users. Although my predecessor’s hack didn’t specify a WorkstationID, and the trace log shows the UI using a fake one, setting a real WorkstationID in the CashRecPostParamRow seems to have solved the problem. I never would have guessed that this had anything to do with solution tracking if not for the SQL profiler, so thanks for mentioning that.