A user (our member), who had been able to log in, suddenly can't log in.
But other users can log in without any trouble.
Only he can't do.
He confirmed 'Username' and password,and changed browsers and computers.
But all login attemption failed.
I think that it probabbly be a bug, because of charaset.
His username consists of Japanese characters '杣 晃人' ( but other usernames doesn't meet any troubles).
Please fix it immediately.