I have been uploading the missing gamedata folders for every game that has had issues saving a score or a score of zero.... uploaded 920 so far.

I did uninstall Reduce ibproArcade best scores of all time 3.6.8 and do not have an issue with any new missing gamedata files.

This thing about the gamedata files - in my gamedata folder, there are absolutely no files at all. Should there be files for every game in there?

Not every ibp game has gamadata files but most of them do..

Oh, well then I'm guessing that's the problem as no files exist in that folder. :( Does that mean I have to hunt down all the games for their data?

Look in the gamedata folder in your arcade folder, not the one in the tar folder.