What is your TV's native aspect ratio? What mode is the 811 set to?
TV: either 16:9 or 4:3
811 Setting for 16:9, 4x3 #1 or #2 @ 1080i. 720p, or 480p
You might have to change it to the opposite of what you have, go to video, then go back and set it correctly for your TV type, and when you go back to video it should be back to normal.