Yeap, I did everything you mentioned. One thing I just did was to run the front-end and choose Update List under MAME. After it did the update, it displayed all 6,000+ ROMS that MAME supports. I went into the GameEX config file and made sure to have it only display the ROMS I really have. Then it displayed about 550 ROMS. Still quite a bit more than I really had, but it was better. It, at least, now displayed all the games that were missing in my favorites, so I just manually went through and added them to my favorites from within the front-end. So it wasn't a perfect sollution, but overall it accomplished what I wanted.