Are you using MAME OS X 0.135?
I heard a lot of people having trouble with this, but I got it to run on my first try.
I guess just make sure you have the current version romsets. Everything needs to be the 0.135 romset, bios and the game itself.
However I wouldn't go too far out of my way to make this run just yet... it'll only run at about 20% speed until Dave re-enables the DRC's.