I don't know if it's related to GPS problem, but since a month or so, after every reboot, my supl.google.com settings change automatically to supl.nokia.com. So, be sure to double-check it - maybe it's not only the case for me... If yes, it would mean some glitch in mainstream cssu.

// Edit

In fact, it *was* changing - it seems that problem disappeared on it's own, as strangely, as it appeared, as I can't reproduce it now. Well, maybe it's just me, but I'm 100% sure that it was the case, at least before last 2 thumb updates..