I am having black screen issues as well. This has happened for a week now and seems completely random. When tuning to a channel, I only see black screen and loading wheel. Sometimes it takes a few tries to get channel to show up properly.
My device is HDHR3-EU cable device.
I'm not sure but I feel that this black screen problem has come more common now and is coming up about 30% of channel changes...
I made a support ticket about this earlier and have sent a few logs of problems as requested.
What country are you in?
Finland
Any news on this issue, it's getting really annoying? Our AppleTV/Channels mediacenter WAF is decreasing rapidly 
Fix coming in the next release.
3.2.15 is out with the fix!