Hello, I have switched from gnome to xfce and came across some issues with xfce + xmonad. One more prominent issue was that xfce4-panel checks if a window manager is running. It does so by looking through all atoms with XGetSelectionOwner(). However, XMonad does not set a window manager atom using XSetSelectionOwner(). Therefore it takes some time until xfce4-panel times out and finally starts up. To overcome this situation I took some code from XMonad's Main.hsc and wrote a function to register XMonad with an atom. registerXMonad :: X () registerXMonad = do dpy <- asks display root <- asks theRoot wmSnAtom <- io $ internAtom dpy ("WM_S" ++ show (defaultScreen dpy)) False io $ xSetSelectionOwner dpy wmSnAtom root currentTime Currently I'm running this from the startupHook, but I think this would be more appropriate in XMonad's Main. Best Regards, Jochen