In Mountain Lion (at least, maybe elsewhere too):

  1. Enter Mission Control to see all windows, and all spaces.
  2. Drag a window or a stack of windows to a space

For me, the first attempt at this fails reliably; the space doesn't get darkened focus appearance, window springs back to original location on mouseup:

The second attempt succeeds reliably; space darkens, window moves on mouseup:

Happens with all applications, on a very fresh install of Mountain Lion, with no UI hack utilities installed, etc. Very annoying at start of workday when trying to place apps in spaces. Is this a bug or some sort of feature I am not aware of?

Update: After upgrade to 10.8.2, this problem is resolved.

  • That’s strange… I don’t have this problem on my two computers.
    – duci9y
    Sep 18, 2012 at 15:59
  • You get the focus behavior 100% of the time, when moving windows? Thanks. Sep 18, 2012 at 19:30
  • Yep, I do. There was no problem in either Lion or Mountain Lion.
    – duci9y
    Sep 19, 2012 at 6:52
  • I could also reproduce the bug in 10.8.1, but it was fixed by the 10.8.2 upgrade. Can you post it as an answer so this question won't get bumped up later?
    – Lri
    Sep 25, 2012 at 22:22

1 Answer 1


Confirmed: the mountain lion 10.8.2 update resolves this problem.

  • Broken again in 10.8.4 - at least for me. Jun 15, 2013 at 18:14
  • Be sure you're not trying to move a window to the space it's already in, or trying to move a window like iTunes, which is not a normal window, but which lives on all spaces by default. 10.8.4 seems to be working OK for me. Jun 17, 2013 at 16:07

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