[xmonad] xmonad-0.9.1 leaves zombie processes around

Hi, after updating xmonad on my OpenBSD machine from 0.7 to 0.9.1 (built with ghc-6.12.2-rc1), I noticed that xmonad now leaves zombie processes around, i.e. it doesn't properly wait(2) for its terminated child processes. This happens for every single launched (and later terminated) xterm as well as for every launch of dmenu. Does anyone else see this problem? Ciao, Kili