Black Screen on Full Screen Extended Display
When I fullscreen the extended display monitor, all other display goes black, and I can't seem to use any application on fullscreen mode with the extended display.
iMac, OS X 10.10
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FINALLY found the trick! Go to system preferences > Desktop & Dock > Scroll Down to Mission Control > Turn on Displays have separate spaces. There you go! It was hidden in there and I thought I had looked everywhere and I am sure you have too!