no mirroring even though icon shows it?

I downloaded the latest apple tv update and since then I can not mirror my macbook pro screen All the menu items seems to be correct and I am receiving pictures from the apple tv menu but when i turn on mirrowing feature my tv screen is blank any ideas

MacBook Pro, OS X Mountain Lion (10.8.2)

Posted on Jan 1, 2013 11:12 AM

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no mirroring even though icon shows it?

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