[xmonad] Re: Issue 402 in xmonad: Xmonad becomes unresponsive. No focus changing (using keys or mouse), workspace changing or recompile.

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Comment #6 on issue 402 by liskni.si: Xmonad becomes unresponsive.  No  
focus changing (using keys or mouse), workspace changing or recompile.
http://code.google.com/p/xmonad/issues/detail?id=402

That looks exactly like being stuck on writing to xmobar.