AirPlay Mirroring tranfers only video and no sound
My iMac (mid 2011) with Mountain Lion is just transfering video and no sound to ATV (the newest one)... I set the AirPlay Mirroring with no problems, everything has the latest update and still I can see only video while audio is playing via my internal speakers. When I tried to set the audio output to "Apple TV - Airplay" I couldn't do it. When I clicked on any other option it just hops back to internal speakers. For now I just tried it in Preview and no ther app but still, it should work from any app, right? Thanks for any help!
iMac, Mac OS X (10.7.3)