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Sometimes for unknown circumstances to me, some applications (like Firefox) lose the minimize button.

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What might the cause be?

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Ooooh, spooky meta screenshot... :) – roe Jul 21 '09 at 18:46
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I am not sure myself but a quick Google search reveals some interesting theories:

From MacRumors:

For some reason the OS seems to get disconnected from the Dock and disables the minimization. I haven't found a cause yet but I usually find that opening /Applications/Utilities/Terminal.app and running: Code:

killall -HUP Dock

fixes it. The only downside is that all windows which are currently having issues will not suddenly start working but all new windows will behave properly.

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It makes sense. After your answer I put more attention on what I did. It seems like switching to a virtual machine, disconnect the application. New instances are fine thoug. No need to killalll. – Oscar Reyes Jul 21 '09 at 18:34
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