Huh! Interesting. I found a shorter way, though - hit ... one of the buttons (can't remember) on the remote twice and voila - fixed. The word "interlacing" comes up on the screen and the blockiness is gone.

HOWEVER.

One other problem I've had - with files that play perfectly visually - is the audio slipping out of sync. The episode starts off fine, and then slowly loses sync with the visual. Any ideas on that front?