Ok, so here's a rather strange one that I've been researching. If I've missed a thread, please forgive me and point me there.
Here's my setup:
HTPC, Relavant parts are an Asus Maximus V GENE, and an Nvidia GTX 650Ti Boost.
Here's my problem:
When I turn on the TV and receiver (the PC is always on), the receiver comes up in 'TV Speaker' mode, which is essentially muted. Due to the HDMI passthrough, this 'removes' the audio playback device in Windows (i.e. no speakers or headphones connected), which then occasionally (but not all the time) breaks codecs in WMC, and it tells me that the decoder is not working properly. (I am using the LAV decoder for audio playback, and the normal WMC video decoder).
If I unmute the receiver, it switches to playing back through the entire surround sound system, but a reboot is required to fix the codec in Windows. I'd really like to not have to reboot my PC sometimes randomly when I turn on the TV. I've tried several attempts at EDID overrides with MonInfo, etc, but nothing has had a noticeable impact. I am an IT guy by trade, so I'd like to think I'm doing the EDID overrides properly, but it's possible I am not.
I have tried multiple NVIDIA driver versions, I've updated the firmware on the TX-NR515, and I've changed out HDMI cables, all from various threads around here. I've even tried taping off the HDMI wires that detect a plugged in cable, but that totally broke audio altogether. This happens no matter what order I power up the gear in. I have HDMI active passthrough enabled on the receiver to emulate a device always being there (like an HDMI doctor, which I've also tried, to no effect)
Has anyone got a suggestion on what I can do or where to research further?