Well, if I'm not mistaken, to erase my username and password, I have to do it in the edit profile option. I get "flags can only be 'u' or 's'", and I have done my searches. From what I know, the "u or s" is only a funnames problem (if this is the problem let me know). I have used Zorch's (your) patch for "u or s" but it doesn't change.
Back to the first sentence, I erase my username and password and retype it, but it still says "Login failed" and in the console, it still says the topic title with the password as plain text.