VERY INTERESTING- Saw this after my reply a moment ago. Turning up the volume did NOT fix the problem for me, HOWEVER, I had recently installed SOUNDFLOWER on my Mac, so when on the TV Audio Preferences, I changed the SOUND PROFILE it was wanting to use to use my 'non-default' (just picked the Soundflower 64bit), my sound on my Mac came back fully!
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I use same setup as OP- Access TeamViewer on my OSX Sierra machine to login to my Windows 10 PC. On most recent upgrade, however, it started killing the volume on my MAC - (Possibly the remote PC also, but noticed because I am usually listening to music either by streaming or through iTunes Podcasts on my Mac while remote connecting out to my PC.) - Here is what I thought was weird, though- I have played around with the sound settings on for my remote connection on PC- (Play remote PC sounds / Not, etc...), AND I've ruled out the issue being using a 'chrome app' version of TeamViewer vs OSX App. And even tested if it is only blocking sounds that are from my Chrome 'browser'- (ie: I am doing Napster Streaming via Chrome VS playing a downloaded local podcast file on iTunes), and even headphones VS Mac Speakers. It appears to just completely mess up at the point of the output of ANY sound when running an active Teamviewer SESSION is running - Reducing to very minimal sound from my Remote PC or Mac, but no issues when TeamViewer is running in background with no connected session open. Really hope this helps! Been using TeamViewer forever and LOVE it. It's an ESSENTIAL tool -especially for MAC users who are forced to do something on a PC from time to time!
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