Thanks Wally,
evidently, it was a temporary moisture issue. I have cut the top of my bubble plastic "case" so it doesn't happen again. I have it in the leather envelope-like pouch my wife made me. The bubble plastic is just for protection so a slit accross the top doesn't matter but it lets the 790 breathe.
I eliminated the moisture bubble by leaving the 790 open for a few hours. Looks good as new. Actually, the thin, long bubble didn't detract from use, yet. I was concerned the screen may be failing in a manner I never heard of. I have 30 days refurbish warranty from Unity Electronics left, so I wanted to insure the screen is O.K. quick.
---Bruised