Old post, but try making sure that the sixad-bin tool is *NOT* running. Once I killed all of these, it worked fine:
2420 ? S 0:00 /bin/bash /usr/bin/sixad –start
2496 ? S 0:00 /usr/bin/sudo /usr/sbin/sixad-dbus-blocker
2497 ? S 0:00 /usr/bin/sudo /usr/sbin/sixad-bin 0 0 0
2503 ? S 0:00 /usr/sbin/sixad-bin 0 0 0
2504 ? S 0:00 python /usr/sbin/sixad-dbus-blocker