This is curious. I was hoping the problem might be linked to the recent change in my system, but it's probably not. More likely, I just hadn't noticed the white flashes before reading about them in this thread.

My wife certainly had a hard time identifying the problem. Last night, after I began seeing the white flashes, I asked my wife to tell me if she noticed anything strange about the picture while we were watching a movie. The screen flashed about five times over a ten minute period. She didn't notice anything but it was driving me crazy. After about 15 minutes I specifically told her, “Tell me if you see the screen flash.” The screen flashed again and she saw it. Now she can't ignore them either.

Ignorance is bliss.

Matt