I am running OS X Yosemite 10.10.5 on a Mac Mini system with two monitors. When I maximize an application on monitor 'A', monitor 'B' then goes black while that application maximizes to fill 'A'.

Why the heck is this happening? How do I fix it?



Personally,. because I don't think they ever thought it through properly. There's a lot about fullscreen that's like that.

The fix is possibly System Prefs > Mission Control > check Displays have separate Spaces

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The better fix is don't use fullscreen, use Alt/click on the green button to maximise instead.

  • 1
    Thank you! This may sound silly, but you have made my night. Now my code development may exist peacefully now, with Firefox open... ;)!!!!! – J-Dizzle Sep 25 '15 at 5:10
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    Nothing silly about having a comfortable workflow :-) I'm a big Spaces user myself - but fullscreen really messes Spaces up. See apple.stackexchange.com/questions/179376/… for some of my other ramblings on the subject ;) – Tetsujin Sep 25 '15 at 5:14
  • I believe OS X El Capitan will be changing some of this. – bassplayer7 Sep 25 '15 at 10:21
  • I hope so, but I'm going to wait for the .1 release to see if it fixes some other things I found even more irritating in the GM ;) – Tetsujin Sep 25 '15 at 10:22

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