I have a setup that looks like this:
+-------------------+ +---------------+
| | +---------------+ | |
| Apple TV | | | | TV |
| +---->| +--->| |
+-------------------+ | | +---------------+
| AV Receiver |
+-------------------+ | | +---------------+
| +---->| +--->| |
| Cable box | | | | Speakers |
| | +---------------+ | |
+-------------------+ +---------------+
The Apple TV is only a few months old.
Using the Apple TV as an Airplay target for audio or video works fine. And if I power-cycle the Apple TV, everything else works fine for one or two sessions. But after a while, when I try to access the Apple TV's internal features, I get a black screen. I can hear the feedback sounds as I navigate around with the remote, so it seems clear that something is happening—I just can't see it. The same is true when using the iOS Remote app. Also, when using the Remote app, I can't "pull" media from my computers' iTunes library, I can only "push" it from iTunes to the Apple TV.
The scrolling-photos screensaver, however, does kick in correctly. That seems like the one internal feature that will show up on my TV.
I would like to get everything else to work consistently. It has occurred to me that the Apple TV might not like being routed through the AV receiver, although I haven't tested whether changing it would make a difference; I'd prefer to keep it set up this way if possible.