Don't how to link bug reports but this seams to be related to (or may be duplicate of) https://bugs.launchpad.net/ubuntu/+source/gnome-control-center-signon/+bug/1174936
The workaround from the other report (https://bugs.launchpad.net/ubuntu/+source/gnome-control-center-signon/+bug/1174936/comments/5) is to set the status to "Offline", manage accounts than change status back to "Available"
Don't how to link bug reports but this seams to be related to (or may be duplicate of) https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-control- center- signon/ +bug/1174936
The workaround from the other report (https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-control- center- signon/ +bug/1174936/ comments/ 5) is to set the status to "Offline", manage accounts than change status back to "Available"