Just installed a Marantz SR6004 in my system & have had some problems with using all HDMI inputs/outputs, so while I'm sorting those out I connected my DirecTV & Samsung Blu-ray DVD to the AVR with component & then component out to my my Samsung HDTV. Also have an Apple TV (2nd gen) that only uses HDMI so I left it connected to my AVR & use my AVR HDMI out to a second HDTV to use the ATV until I resolve my other HDMI issues. I didn't want to have add digital audio cables to this so I left all my HDMI cables in place for audio, which my Marantz manual indicates is OK. Everything works as expected except whenever I change audio volume on the AVR (unit or remote) it temporarily interrupts my video to the component HDTV (not the HDMI TV) & if I mute the volume, I lose all video until I turn off the mute. Any idea what is causing this? Thought I might check to see if there might be an AVR issue before I just unhooked the HDMI & used digital audio cables.