Just picked up the new Apple TV, but I am having issues getting 5.1 dolby digital to work on most of the Apps. I know it is setup properly with my receiver because Apps like iTunes Movies, Netflix, and HBO Go work fine - my receiver recognizes that the sound is coming in as Dolby Digital and sounds great. However, on Apps such as WatchESPN, ABC, HGTV, and pretty much everything else I could download, the sound was stereo only. Is this a limitation of the App? This is a major disappointment if the Apps are not broadcasting in 5.1.