trying to watch a movie using the WD TV Live I could not get any sound out to my audio receiver using the optical link. After half an hour I remembered that I used that Zappo TV App on my iPhone to play some music earlier that day. Closing the App on the iPhone did not work. At last i found out the I muted the sound on the Zappo App and therefore the WD TV was not outputting any sound any more. ‘Un-Muting’ in the Zappo App solved the issue.
Is there any way to identify this App mute from the normal WD TV menus?