[xmonad] Can't get Urgency Hook to work

Here is the relevant bit from my xmonad.hs: main = xmonad $ withUrgencyHook dzenUrgencyHook $ gnomeConfig When I echo a bell character from xterm, the corresponding button in my "task bar" flashes, however nothing else happens. dzen2 seems to be working ok, and I see nothing in .xsession-errors. I read all of the doc for UrgencyHook, played with SpawnUrgencyHook as well, I can't see what I'm doing wrong... Could it be that the task bar catches the event and prevents it from being dispatched to xmonad? Or what?