Sadly, a known issue. Screenshot facility hasn't worked since day one.
Quote:
Originally Posted by dcoulson
When I do Cmd-Shift-3 on my Mac Mini, OS X will take a screenshot of my primary display on mDP and my secondary on mDVI as two separate files on the desktop. it does not take a screenshot of my DL attached display.
I can use Cmd-Shift-4 + space to take a screenshot of the DL display or specific windows on it.
Is OS X not taking a screnshot of the DL screen with the other two a bug or a limitation of the driver on OS X?
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