OK, so I know this thread is four years old, but I’m hoping someone is still monitoring it.
David, I tried the suggestions that you posted from the FAQ, but my DVD is not automatically switching between letterbox and full screen.
If I set the video mode for the track to 4:3, it ends up as full screen on both HD and SD screens. Which is fine for 16:9, but terrible on 4:3. If I set it to pan-scan, then (again) it looks fine on the 16:9 monitor, but it’s a true pan-and-scan image on the 4:3 monitor – the edges are cropped. If I set it to 16:9 letterbox or 16:9 letterbox+pan-scan, then it ends up being letterboxed everywhere – on 4:3 monitors (which looks OK) and on 16:9 monitors (which makes everything look reaaallly wide – might be OK to simulate Cinemascope).
So what settings do I need to tweak to make it switch automatically, like you say it should? Or should I just assume that the majority of TVs by now are 16:9 and not worry about the 4:3 Luddites?