You said they should all work, so I'm still wondering if there's an issue with the romset or how it's set up. Not all games work. Many dont, and the ones that do have clones or other versions that don't work. For instance, the very first game on the list of all games, 1 on 1 Government, doesn't work at all. Even in Mame, it says rom/disk images for the selected system are missing. But with a full non-merged set I don't see how that is possible. I didn't touch the romset at all, it is still zipped and I haven't done anything to the folders. I didn't even rename it after download.