Well, I've tried everything I can.
It's an odd situation. I've rebuilt the indexes. I've gotten rid of several resource files (FoxUser), yet I still ahve the Internal Consistency Error each time. What is odd is that it only happens in one of the three company's data. We have the user select which company he will work with right after he logs in to the PO System, so their forms are pointed to their specific data. It is only happening with one company's data, not the other two companies. It would seem logical that this is indeed a data problem, perhaps indexing, but that may be ruled out now. What next should be considered?