I did not notice anything but then there was a message that said that the notification deamon crashed. Here is the crash report:
** Attachment added: "crash report" http://librarian.launchpad.net/4661677/_usr_lib_notification-daemon_notification-daemon.1000.crash -- Notification-daemon Crashed https://launchpad.net/bugs/62488 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs