new comments: one reboot later, these errors are gone (.xsession-errors clean), so Mist theme seem not be the reason. This instead have happened when i was switching between several themes (system - apps -appearance).
** Attachment added: ".xsession-errors" http://launchpadlibrarian.net/41502948/.xsession-errors -- gnome-appearance-properties: gdk_display_sync: assertion `GDK_IS_DISPLAY (display)' failed https://bugs.launchpad.net/bugs/543303 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-themes in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs