I'll try to get better pics posted tonight or tomorrow, that will better illustrate the issue.
Larry -- It does it on all inputs, either direct from source or through my Denon AVR. Sources tried were all HDMI; I don't currently have any analogue sources with which to test.
There are two things that've been "done" to the set that may explain this: 1) A month ago, I applied the FBr fix. Everything had seemed fine since then, however. 2) My wife accidentally dropped the remote when cleaning up last night. The TV had been off. She said when she dropped it that the TV's red light flashed on, it "sounded" like it was coming on, and then the TV shut back off before any picture could be displayed. Maybe this put a jolt through the system?
To be more clear about what I'm seeing, here's a picture of the scene above from Spongebob, that shows what it's supposed to look like.