For all of you using the great SMS / IM App TextSecure: I had problems after every update of the Fairphone OS. So did my girlfriend who owns a FP as well.
The thing was, that after every update, I was unable to receive encrypted text messages, however still being able to send them. After a while I figured out, that re-registering with the server fixed the problem.
Still as I just didn’t received encrypted text messages anymore, it took me a while to figrue out, that my device was causing the error. It is probably caused by some gcm issue.
So my advice for all TextSecure users would be to re-register with the TextSecure servers after every update, just in case.