There are a couple of things that could cause this to happen. The program creates a few TPS files which is where the data is stored.

1. If these files got deleted then the program would create new ones.
2. If you run the program from a different location than you previously ran it new TPS files would be created in the new location.
3. If you re-unzipped the program from the downloaded zip file the files may have gotten overwritten with new ones.

If anyone else using the program has had anything like this happen please let me know.