Thread:Project:Support desk/Login error (2)

Hi, I have a very irritating problem at the moment. I cannot log into my website even with a valid username. I'm only getting the message "Login error - You have not specified a valid username.". I believe that it happens when a user gets administrator rights, because on other accounts that doesn't have administrator rights can pass. It's irritating me extremely because it is the only user account that has administrator and bureaucrat rights. How can I solve this problem?

Thank you for your time.