I have openbox frozen randomly, maybe the same:
* application need dbus will report unable to find session(kmix etc)
* openbox do not response to keybings any more
* in the console, with export DISPLAY=:0, run xterm, no error report
but no terminal window appreal in XI use exec ck-launch-session openbox, openbox-xdg-autostart to load ibus,kmix etc

