Help! This might be a little long, but I don't want leave out anything that could be key. My setup has been the same for the last 3-4 years until recently. The initial setup was HDMI from Directv receiver to LED TV, optical cable from home theatre receiver to LED TV, and HDMI from ATV (2nd gen) to LED TV. No issues, ATV music library plays clean and clear, and photos flow through the TV with no problems whether playing from iMac desktop via wifi, iPhone, or Macbook. Due to family room reconfiguration, I had to change the setup a little bit in order to maintain all sound (tv and music) running through the home theatre. The change required running a digital optical cable from the home theatre receiver to the Directv receiver. All other connections remained the same. Since this change, the only thing I've played is live streaming a church sermon from my iPhone 6 to to the TV. Note: as with the previous setup, when I want to stream music/photos via ATV, I simply change the input on my TV to the HDMI input designated on the TV. For some reason this no longer works. While I still see all the ATV menu items, photos, and music library art, etc., when I play a song, there's no audio. I have no idea why I've lost audio. I have a 3rd gen ATV connected to my master bedroom tv, and that works fine. I took that one and swapped it with the home theatre ATV, and again, no audio. Very strange to me, so if you have any reason for this, please share...tks.