I am suddenly getting a "User not found" error for (all 2) existing users. They show up at http://forum.myanmar-dictionary.org/users and in the database table (as "handle"). I tried to deactivate the Facebook login plugin by renaming the folder, it didn't help.
There is no conflict with external authentification from Facebook or others since both users were registered directly on my Q2A site.
Any hint what could be the problem? Thanks!
EDIT: Need to reply before the question was even approved: I forgot that I needed to use the email address, instead of the username.