LOL it's a widescreen TV. That's the point. It's a widescreen TV and a widescreen XVID and it still plays stretched out in letterbox. To make it look right I have to put my widescreen TV into 4:3 zoom mode, but that degrades the quality. If it gets a 4:3 XVID on the other hand it plays it full screen.
Annoyingly my old DK Digital player played XVID fine in widescreen.
The only solution I can think of is trick the 5055 into thinking it's a fullscreen xvid. Not sure how to do that though. Anyone?