Comment 8 for bug 236813

Take a look in $HOME/.dbus/session-bus/ to make sure you don't have any extra session files. You can figure out which one to keep by matching up the id on the first line of the file with the running process:

chin@sven:~$ ps -eaf | grep dbus-launc[h]
chin 6678 1 0 Jun19 ? 00:00:00 dbus-launch --autolaunch a79877a8538ed3ab66c4c900462e067b --binary-syntax --close-stderr
chin@sven:~$ head -1 ~/.dbus/session-bus/*
# This file allows processes on the machine with id a79877a8538ed3ab66c4c900462e067b using