I'll try that, thanks. I do have it running under .139u1, but I plan to use at least .144 with my new cab, and may update my older one to that, too. I was able to see a list of the missing files in MAMEUI, but I didn't think about Googling them until I read your thread. Much obliged.
Now... I'll go ahead and Google this too, but in case I can't find anything or get too many unrelated results, is there a quick and easy way to covert existing .CHDs to work under .145 and above?