I just made an account and had trouble posting to forums. I logged in at front page and everything was fine, but when I moved to forums it showed this in upper right corner:
This was even there when I wasn't logged in!
Only way was to use Chromes Incognito mode, go to forum page 'log out' and then log in again
It might just be that the session has expired, if it only happens every couple weeks. But it's not the best behavior -- we should definitely be redirecting back to the signin page once a session expires.
Anyway, we'll be taking a look soon Thanks for the additional information!