I have a Yamaha HTR-6030 receiver with an XBox 360 attached. Sometime during Christmas holidays something in the setup changed, and I no longer hear the center speaker when I'm in true 5-channel Dolby mode. If I switch to "Music Enh. 5-channel" sound, I hear the center speaker but not the front speakers. (The rear speakers and subwoofer are not affected.) The result is that I lose 5-channel but hear the dialog and sound effects in games, or I hear wonderful background music but lose the dialog. Does anyone else have a similar Yamaha model, and understand its menus well enough to point me toward a solution?