IMac + HDTV

Hey folks,
Got issue with imac.
27 inch, late 2012, OSx 10.8.4
Connected to Sony HDTV (mini display - HDMI)
Works fine, BUT as soon as I start a video on the HDTV and make it full screen, the iMac blacks out and you can not do anything on it, unless you close (exit full screen) the video.
I am missing anything?

This issue will be addressed in the future with 10.9 Mavericks. I'd recommend looking over the feature set in Multiple Displays.

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