I realize this is a really old post, but did it get resolved? If it did, what was the root cause?
Hi Ken, not sure if it is related. I had something similar with a customer of mine. He had data disappearing from one particular variable on a data card. It turned out that he had multiple file extensions mapped for the same attribute so PDM did not know which one to write to/read from
Maybe check your mappings and see if you have any of the same.