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