I have a Sony STR-DH700 Receiver. Hooked up via HDMI straight to 42" Panasonic Viera LCD flat panel. HDMI to PS3 and HDMI to Comcast cable box. When I try to change the settings for sound/speakers using the A.F.D., 2ch, and Movie buttons, the receiver displays "not used" and i cannot choose different settings. It works great and these buttons do work when im watching tv, the only time it does not work is when im using ps3 so therefore im assuming its a ps3 audio setting problem. i went through the settings and it all seems good. i have all 5.1 and 7.1 settings check marked. still cant change it. it worked fine for a month after i hooked it up, but all of a sudden i came home and it didnt work. i reformatted the ps3 settings to factory and also reset receiver settings back to factory, still nothing. any ideas?