Comment #12 on issue 226 by SpencerJanssen: XMonad.Prompt lockups with ghc 6.10 http://code.google.com/p/xmonad/issues/detail?id=226 This seems to be a GHC optimization bug. As a workaround, try this in xmonad-contrib:

runghc Setup clean runghc Setup configure --disable-optimization # and any other flags you usually pass runghc Setup build runghc Setup install xmonad --recompile

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