Hi I found a new Bug.
If the screensaver or a Diashow is running and you will press menue on the Apple Remote the Apple tv loses the HDMI Output Signal. Black Monitor on the TV.
After I will Press menue and down I will get the Signal back after the reboot of the ATV.
Occurs also with the new Maintance Release.
Support request (#18891) submitted.
same here 
same here
I have the same problem. Is there a solution for this problem?
Until now I don’t get a statisfying answer.
Hi Folks,
I have the same issue also - lose HDMI whenever the screensaver comes on, only solution seems a reboot!
Hope this is resolved soon!
This issue has been fixed in today’s Beta7 update.
Details here: aTV Flash (black) Beta7 Now Available | Firecore