This was as serious as any BSOD. I was using chromium-browser and when I used the mouse to copy the URL, the whole system just froze. The mouse still moved on the screen at first, but nothing else worked, then the mouse froze too. I doubt it had anything to do with chromium. I couldn't use ctrl-alt-F1 and the machine seemed to disappear from the home network, so I couldn't even see it, never mind ping it or ssh to it. Here are the messages from /var/log/syslog (my machine is "taxa2"): Jul 24 17:02:49 taxa2 org.gtk.vfs.Daemon[2445]: fusermount: failed to access mountpoint /run/user/1000/gvfs: Permission denied Jul 24 17:02:50 taxa2 hud-service[2166]: #033[31mvoid DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*)#033[0m: "No such interface 'com.canonical.dbusmenu' on object at path /org/ayatana/bamf/window/67108867" Jul 24 17:02:54 taxa2 unity-panel-ser[2034]: menus_destroyed: assertion 'IS_WINDOW_MENU(wm)' failed That's what happened just as it got stuck. There was nothing for 25 minutes before that and nothing after that until I reset the computer and rebooted. Any ideas? Could it have anything to do with samba? (That was running, but nothing should have been accessing it at that time.) I was not using sshfs. Mike