HT201343 AirPlay Mirroring. The ATV3 screen goes black.

When my mid MBP 2011 connects via AirPlay Mirroring. Mountain Lion.  The screen goes black. It has worked before. Now it doesn't.  I checked firewall, graphics switching and rebooting all devices.
Streaming via iTunes works fine. ATV3 can access my MBP's library.
thanks!

Problem solved... sorta!
It appears that Parallels 7 is not compatible with Airplay Desktop Mirroring in ML
If you remove this file com.parallels.desktop.launchdaemon.plist
inside
/Library/LaunchDaemons
then reboot.
ATV3 now works again with Airplay Mirroring.
However, it breaks Parallels.  And you simply cannot put the com.parallels.desktop.launchdaemon.plist file back inside /Library/Daemons.  You need to re-install Parrallels. Could be a permissions thing, but I tried to repaire and follow Parallels instructions on how to start and stop the service.
I Hope this helps save someone some time...

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