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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.

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That’s strange… I don’t have this problem on my two computers. – duci9y Sep 18 '12 at 15:59
You get the focus behavior 100% of the time, when moving windows? Thanks. – Jamie Sep 18 '12 at 19:30
Yep, I do. There was no problem in either Lion or Mountain Lion. – duci9y Sep 19 '12 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? – user495470 Sep 25 '12 at 22:22
up vote 0 down vote accepted

Confirmed: the mountain lion 10.8.2 update resolves this problem.

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Broken again in 10.8.4 - at least for me. – user2071400 Jun 15 '13 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. – Jamie Jun 17 '13 at 16:07

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