I have noticed this occuring in the last few weeks. I take the HD-Tivo out of "stand-by" mode which brings up menu and the television screen is nothing but a mass of red and green lines. I can just barely see when I move the curser to the "live-tv" selection and pick it. Once this happens I still have this mess on my screen. I then use the remote to change from 1080i to 480i and the problem clears up. I can then go back to 1080i on the HD-Tivo and all is fine. This doesn't happen every time but enough that it is annoying. My t.v. is a Pioneer CRT RPTV which handles 1080i but not 720p. I have the HD-Tivo set up to only switch between 1080i and 480i so I do not know what the trouble is.