Well, I reformatted my PC. We'll see if this makes any difference. The zinc loader I have parses the gamelist to GameEx, so that can't be the problem. The only other thing I can think of being the culprit is Avast AVS, so I'll try and install that after I install GameEx. Otherwise, I can't determine the issue here, and frankly it's driving me gonzo! .:EDIT:. Well, as it turns out there must have been a problem with my MAME build. I updated to 0.127 and re-compiled it (using HK's MAME compiler... Props for a very useful app!) and set it up to utilize my CPU, now I have no problems. And to think I re-formatted! *sigh*