I have an HP desktop I bought for photography work and I have the weird behavior described, too. I've found that if I uninstall HP Audio Controls or whatever it

I have an HP desktop I bought for photography work and I have the weird behavior described, too. I've found that if I uninstall HP Audio Controls or whatever it's called it leaves me alone and the windows output selector does a perfectly fine job of switching outputs. However, I mostly use it connected to an external USB DAC and it works (mostly) ok.