I posted this over on Mameworld as well, but I thought I'd give it a shot over here too. I made the mistake of overwriting my current Catver with one for Mame105u3. Well I'm only running 104u6 (so as to use my wingun drivers still), and Mamewah has problems with generating custom lists unless you use the catver for the version you're running (otherwise you always get stray games added to whatever list).
If anyone has an earlier version, I'd appreciate a PM.
Thanks all!
Mike