I have got the new TV Box since last Friday. With the Horizon I had the following set up:
TV LG, Connected to a Sourond Receiver Pioneer VSX 521 via HDMI. On the Pioneer I had the Horizon Box and Apple TV both via HDMI.
With the new Box I have exactly the same set up. Unfortunatly when I want to change on the Pioneer the input chanel from TV Box to Apple TV the no signal is found anymore. Receiver gets back to the TV Input chanel. Apple TV only get to the TV if I disconect the TV Box from the reciever.