Not sure if anyone has seen this before, but it's new to me and I've been using Premiere for years. Just updated to latest version CC 2017 and whenever I have PPro open any video I play on my system (VLC, Quicktime etc.) I get no sound. Likewise, any videos played in any browser (youtube, Vimeo etc.) won't play at all. If I shut down PPro then everything works again, so it looks like it's hogging the graphics and sound card for some reason.
I have Nvidia 1070 card.
Moved to hardware forum for expert advice.