I would temporarily remove the AVR from your setup. Turn off the AnyNet and HDMI-CEC and connect the HTPC directly to TV. See if there is any issue without the AVR in the loop. If there is no issue, then connect the digital audio out from TV to AVR (skipping the HDMI input to your AVR). It should work. The less HDMI cables, the better. If there still is a problem, check the order that you are turning on the HTPC and TV. In my situation, I turn on the TV first, wait a few...