said by spider1225:Now that it seems that all standard def channels are upconverted to high def, the aspect ratio function on my tv is no longer available. I can no longer zoom letterboxed shows so I have a black bar around the entire picture.
Have you tried enabling NATIVE mode?
This has been a big improvement for me. The SD channels are sent as 480i to my TV and its justify mode fills the screen. It also provides better PQ since its native upscaling is (marginally) superiod to the cable box.