In X.A.Submap, the keyboard is grabbed to handle the submapping. However, the keyboard is not released until *after* the action is executed. This creates the situation where any action which requires a keyboard grab (such as submap itself), cannot be submapped. I encountered this issue with WindowBringer where dmenu would fail to appear since it failed to grab the keyboard. A delay could be used, but this is just a race. Testing is probably needed; I've seen no issues so far and I'm a heavy user of submap (my modMask is essentially <Ctrl-i>). --Ben [1]http://git.benboeckel.net/?p=dotfiles.git;a=blob;f=dotfiles/base/X11/xmonad/... 1 patch for repository http://code.haskell.org/XMonadContrib: Sun May 15 17:03:12 EDT 2011 Ben Boeckel * ungrab-keyboard-before-action If an action that requires the keyboard to be grabbed (e.g., launching dmenu), it is a race when submapping the action as to whether the action will have access to the keyboard or not. To fix this, the keyboard should be ungrabbed before executing the action.