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Sep 8, 2014 5:47 AM in response to LodewijkClaeysby Matt Clifton,Do you definitely have 10.9 as your profile says, or do you have an earlier version of OS X? Check using your Apple menu (top left of your screen) and click About This Mac. It will tell you the version of OS X.
10.8 and earlier do not support multiple displays in full-screen mode - the other display will go blank as you describe. 10.9 will permit use of the second display while the first is in full-screen. In addition, you should be able to display the dock and menubar by hovering at the top or bottom of the second display.
Matt
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