The first problem is, when anyone registers and tries to log in, they get the error message "Username does not exist", so I've resorted to registering accounts for people. 

I just recently added a new board and a new child board, and ever since, when a new members tries to log in they get the message "Please complete username and password feilds", which they had already done.

Any help here would be great.

If it helps at all, my website is located at http://teamblurred.com