A few people have had trouble signing in, getting a message that the password isn't correct and not being able to reset it, then trying to re-register and finding that the nick is already taken.

I don't know what is causing this, but Eddy found a solution:

Register with a different screen name, then once you get onto the board, enter your PROFILE (located underneath the banner at the top of the page), and change your nick back to the one you prefer.