How do I get my audio back on PC after a Game Stream session?

You have to properly end the session on the Shield. I'd recommend using Moonlight and use the "quit session" option you get by clicking on the icon of the game you've just exited from.

Thanks I finally figured it out.

Why does it force it back to NVIDIA HDMI out every time? I want to stream to my PC speakers while Game Stream is active, but I can't! Edit: I had to disable NVIDIA HDMI out. It didn't work the first time I tried this, but now it is. I am getting audio to both PC and TV. I think I may have gamestream setting set to "Audio on PC" option.

Just for information, a little trick to reinit nvidia streaming server and remove the blocked session : restart the service "NVIDIA LocalSystem Container". You can do it by launching this command line (run cmd in administrator mode, then...) : net stop NvContainerLocalSystem & net start NvContainerLocalSystem

when still streaming session, just hold start on the gamepad -> gamestream ui pops up -> go to the 3 vertical dots and press "a" button -> quite game (gamestream session) -> choose "okay/yes" to quit gamestream session it should go back to normal on your pc.

The information that you comment was concise and to the point, and directed me to exactly where I needed to go. Thank you for making efforts that you didn’t have to make.

I was trying out game stream and after the session I exited Game Stream on Nvidia Shield. My wife started up another app on the Shield. I went back upstairs and I could not switch my audio back to PC Speakers. When I went into Sound playback devices to manually set default audio source it would just switch right back to "NVIDIA HDMI out" every time. Is there a correct way to end my Game Stream session or do I have to manually turn this off on GFE app?