[xmonad] Issue 509 in xmonad: Sometimes cannot switch focus using keyboard shortcuts

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Comment #2 on issue 509 by daniel.w... at gmail.com: Sometimes cannot switch  
focus using keyboard shortcuts
http://code.google.com/p/xmonad/issues/detail?id=509

See also  
http://www.haskell.org/haskellwiki/Xmonad/Frequently_asked_question#XMonad_is_frozen.21  
(and apologies for not linking this earlier). For some reason I never saw  
this bug get created -- must have just skipped it while reading my mail.