I had the same problem and I found that even though you are in DVD mode under "Activities" Some of the buttons like the screen size button is actually from the TV. "Activities" mode is a mix of buttons for different devices. Go to the Set Up A/V Devices screen hit "TV" and under [try & learn] find "size" and have your remote learn the code from your TV's remote for the widescreen mode or whatever. This worked for me. Good luck.