I've noticed that when I view HD material that there is a mild shake to the screen. The further you sit the less you notice, but if you go right up to the tv you can see a constant shake. It is especially bad in cartoon shows when the images are made up of a bunch of horizontal and vertical lines. I previously thought it was the DVR, but I've had two since.

Has anyone else heard or know of this problem? Could it be the cable? TV?

P.S. It is an Optoma RD-50A DLP hooked DVI to HDMI.