Just tried to watch my upstairs HD tv last night with my 722 in "dual" mode. I got the "extreme stretch-o-vision" picture and couldn't find a way to correct it. The format mode only offered "letterbox" which was the stretched with black bars top and bottom, and the "normal" which was stretched without the black bars but both sides of the picture chopped off. Neither looked good.
Don't know about everyone else, but this really screwed up a good feature that we used every night! I hope a fix is coming soon.