I've removed Tangerine from my Startup Applications, and the problem seems to have disappeared.
May be related to this bug: https://bugs.launchpad.net/ubuntu/+source/tangerine/+bug/455238 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/838792 Title: "Restart" logs out, even when there are no other people logged in To manage notifications about this bug go to: https://bugs.launchpad.net/indicator-session/+bug/838792/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs