Hey M.A.M.E Power,
Great suggestion, but I'd already beat you to the punch, so to speak. I decided last night to try that very thing.
At first this morning, I had the same problem...and I thought, this is ridiculous. However, combining information in this thread, I decided to try and adjust the MAME config settings first. Tried screen res I don't know how many times...nothing helped.
Then, sanity took over. I spotted a little line in MAME config that is near the top labeled "hwcontrol" or something like that. I noticed it was set to "1" (on). I thought to myself, I'm going to turn that "Off" and see what happens.
The result - PROBLEM SOLVED!
It's just trial and error sometimes I suppose...but again thanks for the encouragement!
RTSDaddy2