I officially declare dbus autolaunch to be broken. I repeatedly get two (session) dbus daemons if I have none running before starting KDE.

Symptoms are things like Ctrl+Alt+Del not being the right shortcut to get out of KDE.

Make startkde use the starting code suggested in dbus-launch manpage (dbus-1.0.2), if somebody knows a better way of fixing it, feel free to.