Torbutton update error and real ip address

At startup of Tor Browser Bundle 2.2.39-5 I got a strange torbutton update error message and afterwards Firefox opened with the check.torproject.org site which showed my real ip address. According to the button tor was disabled though I did not do anything unusual. Strangely this was the first time this happened and I used the current version of tbb several times already. Now it is working again and I'm not able to reproduce the problem.

Thanks and greetings

Trac:
Username: Rob