No problem, I understand with all my posts it's not always easy to follow ;)\nEven before thinking about getting back to home theater I struggled with having hdmi 2.1 working from my PC to my Samsung QN90A. I installed a FiberCommand 100 feet hdmi 2.1 extender (it was a good training before wiring speakers). I tried to get a clean install with pc -> hdmi cable -> wall outlet -> extender -> wall outlet -> hdmi cable -> TV but I never managed to get 4k hdr 120Hz with VRR working. I had to remove the hdmi cable and wall outlet between the pc and the extender to get something that works (I mean the extender is plugged into the PC graphic card).\n\nI then installed my AVR, and tried windows Dolby Atmos games. At first I was happy, Shadow of the Tomb Raider or Ori and the Will of the Wisps were propertly outputing Dolby Atmos by my RX-A8A and were sounding great... but with 400ms audio lag. So I plugged the PC to the AVR (losing VRR and 120Hz until the firmware update will maybe solve that) to see if the audio delay would be the same. The audio is not there anymore when doing this BUT my RX-A8A only receives Dolby Atmos DD+ (instead of PCM with most of the other Atmos sources) when playing Atmos video, and Games are now outputing a 7.1 audio stream which I suppose is a classic Dolby Digital bitstream. I contacted Dolby through the Dolby Access app and they were saying they were aware of this issue.\n\nSo here I am right now. I have a humming issue with my hdmi extender, and I can't use dolby atmos in games (Dolby responsability) nor use 4k HDR 120hz (Yamaha responsability).\n\nI will be patient. Because otherwise the sound quality is way above what I was expecting for stereo music or movies.\n\n\nHonestly, you have so many "things" in between your PC and your TV I'd have been shocked if you didn't have issues. HDMI is such a crap standard, installs like yours always tend to have issues. A lot of it is that these aren't active connections so signal loss (or in your case delay, apparently) is a major issue.\n\nI would advise you start a thread so it's easier to keep track of, but we've got folks here that can help with this, but I'm willing to bet you'll be advised to eliminate as many wall outlets and such as you can. No easy task, obviously, but I'd see if you can test without the wall plates just to see if those are part of the problem.\n\n@BMXTRIX knows more about this stuff than I ever will.