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This should be against the switchdesk-1.2-2 component but it wasn't in the list. In /etc/X11/xdm/Xsession, if anotherlevel was selected it exec's /usr/share/apps/switchdesk/Xclients.anotherlevel which fails as its not executable. Simple fix is to make it executable (like /usr/bin/gnome-session).
fixed in later switchdesk release