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I've got an odd bug on one of my machines. It only occurs on the one Mac so it's not a bug in the OS per-se, but it's very annoying and I can't work out how to fix it.

Basically panel windows which are not set to Hide on Deactivate (such as Mail's Activity Window) aren't properly hidden when I hide their parent application. The window remains on-screen but cannot be interacted with.

See a demo here: http://www.youtube.com/watch?v=t9BPCYqpdKI

I suspect that WindowServer has become screwed-up somehow.

How can I restore WindowServer to sanity? Does anyone have any ideas?

Thanks for any help.

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up vote 0 down vote accepted

I had to wait a while - but upgrading to Mountan Lion fixed this for me. (just in case anyone else had this issue - unlikely though it seems.)

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