Comment #6 on issue 189 by aleks.dimitrov: MultiToggle to Full and tabbed layout makes X crusn http://code.google.com/p/xmonad/issues/detail?id=189 Hello, I'm not the original author, but I just wanted to say that I ran into this issue yesterday, too. At first it manifested itself in XMonad consistently segfaulting, and when I pried a little harder, I could reproduce the OPs exact problem (I think.) The following configuration triggers it: import XMonad import XMonad.Layout.LayoutCombinators hiding ((|||)) import XMonad.Layout.MultiToggle import XMonad.Layout.MultiToggle.Instances import XMonad.Layout.Combo import XMonad.Layout.Tabbed layouts = mkToggle (NOBORDERS ?? FULL ?? EOT) $ simpleTabbed **||*** Full main = do xmonad $ defaultConfig { layoutHook = layouts } I'm using XMonad 0.9.1, Unbuntu 10.10 (using the XMonad version of the Ubuntu repo.) In my case, xmonad usually segfaults when I try to change something about the workspace's dimensions (say, mod-H or mod-L or mod-B, all of which trigger resizing of the windows.) Any way to work around this?