The menu / guide on my DTC-100 does not use the full horizontal width of my screen as I have experienced with the non-HD directv receivers. Changing the mode / aspect ratio does not seem to help. (The actual video program is displayed correctly to the full width-- it is just the guide / menu). Is this normal? I have a 4:3 toshiba 55hx70 connected using the component cables through the RCA converter. Any input?