I have to allow an empty username to begin with, as the login details are their email address and password(I have already modded this part), which ties in with the main site. The blank username is then used to distinguish between those who have specified a forum name and those who haven't (a lot of our site members will never bother to use their forum account, but they have one anyway).
Echo statements break the forum pages so you end up with just a blank page, I believe this is because of how the templating works. I'm working with vB 3.0.7 btw, should have really said this at the start.
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