Comment #7 on issue 317 by daniel.schoepe: Util.XSelection.putSelection repeatable hang http://code.google.com/p/xmonad/issues/detail?id=317 As a workaround, you could rebind C-c to quit the prompt instead:

.. defaultXPConfig { promptKeymap = M.fromList [((controlMask,xK_c), quit)] `M.union` promptKeymap defaultXPConfig }

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