Has anyone else had Tivo change their video output format? I have a new Series 3, a Panasonic 50 inch plasma, and a Yamaha RX-v2700 receiver. The plasma can handle all video formats, so I set the Tivo video output format to Native. Great picture. Once I turn the TV and receiver off, the next time I turn it all on again, the Tivo has switched video output format to 720P Fixed. When certain shows are displaying with 720P, I see those aggravating white lines at the top of the screen (based on other posts, thats from the closed captioning signal). They don't show when I switch back to Native. But, of course, next time I turn TV back on, Tivo has switched me to 720P again. I'm connected from Tivo to Receiver to Plasma, all with HDMI cables. Help!