no no, its fine. By now, i'm sure people have started playing with it. No need to switch.
If it works well for you, then i think my suspicions are correct, that it's mameosx, and not the game. I'll try at home when i get a chance.
EDIT - I never really bothered checking much, but it appears that mameosx is running mame .135. (or its version .135 of mameosx, so i'm not 100% sure)
But i'm running .159 (i think?) at home. So i'll give it a try.