i might have a problem that can be fixed by your approach:
Currently i have an HTPC and a XBOX via HDMI connected to my Denon 3311 AVR. My TV is connected vie ARC.
When I turn on the TV to watch cable tv via the integrated TV Tuner, I do not have any sound via Denon AVR (input source is set to TV, ARC and Anynet is activated).
Accidentally I found the workaround: when I turn on the HTPC in the background without doing any source changes etc at both TV and AVR, my Denon suddenly plays sound coming from the TV channel.
When I turn on the TV and switch to XBOX or HTPC I have sound directly but when watching TV I need to activate the HTPC (it does not work though if I start the xbox). When I turn off the HTPC shortly afterwards I still have sound.
It seems that switching on the HTPC it triggers the sound for my TV channels on Denon.
How could that be possible? Any solution to that?
I will try disconnecting my CD PLayer, which is connected via cinch to my Denon. And also the XBOX and HTPC and check whether I will have sound directly without the workaround.
In the meantime, can you tell me where the problem might stem from?