In the next few days, the forum will be upgraded to the ProBoards v.4 software. During that time, the forum will be offline, and an upgrade notice will be seen instead. Afterwards, things should work fine, but the next time you log in, you will be asked to enter your birthdate to comply with US law, and you will then be sent an activation e-mail. Also, user names will stop being case-sensitive, so let's say Bob and bob will both be the same. If two users have the same user name, then the system will add a number to the end of additional users with the same user name.
My opinion is that this is based on the Honor System. But mine is not an official answer about it.