For a few hours, some users received wrong password error messages and were unable to log in the forum or even reset their passwords. This was caused by the corruption of the users table in our database after a quick maintenance done today. No, this was a not a security incident, so don't freak out. Anyway, it's always a good practice to change passwords so if that makes you feel safer, by all means, do it.
Problem was fixed a few minutes ago. Sorry for the inconvenience.
PS: No, I didn't rollback the forum either. No posts were lost.