Axiom Home Page Forums General Discussion Home Theater Denon receiver changes DVD aspect ratio?

This is probably a hideously stupid question, but I cannot figure it out.

Got a new to me Denon receiver today, AVR-787. I want to run/switch my video sources through the receiver so that I don't have to switch inputs on my tv when changing source. The connections are simple enough, multiple component video inputs and one set of component video out to the tv. (No HDMI on my set.)

My Dish Network PVR works perfectly, I get a 4:3 picture with bars on the sides for SD signals, and 16:9 for HD signals. My DVD, however, always is displayed at 4:3. I've checked every setting, and can't figure it out. So then thinking the problem is with the DVD player itself, I connected it directly to the tv without going through the receiver first, and the picture displays properly as 16:9.

Any advice?