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
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