[xmonad] Mod-P blanks screen (XMonad.Config.Gnome)

[Max Rabkin]

Hi

I'm using XMonad.Config.Gnome (at least, its keybindings) under Ubuntu
10.10 (Maverick), through gnome (with XMonad set as my window
manager). My xmonad.hs is copied from another machine, which is
running Ubuntu 10.04 (Lucid), where it works fine.

Instead of opening the "run application" dialog, pressing mod-p (mod =
left super) blanks the screen for about a second. When it comes back
on, there is still no dialog.

Has anybody else encountered this, or know a solution?

--Max