Hi folks, an update and recc closure, did more troubleshooting, tried to run local windows audio troubleshooter, it failed, it tried to reload driver, it failed. I went back to settings/system audio tried "test" and it failed for me (could not hear anything. My default output sound device was set to sony avamp. This same tool offered driver update, I said yes and it reported an active update pending restart, I restarted and then noticed that my default audio output device switched to "Realtek audio". This option/setting was not present earlier. I went back to home.nest.com and can now hear audio on recorded events and in live view. Some faith restored! I have seen this artifact before when windows updates are pending, some things stop working.... ty for looking.... Please close this thread.
