Blame the Spam Robots!
Direct registration in no longer permitted because we have been spending too much time weeding out those who just want to use the forums to send spam to the users.
To register you MUST have the following line in the subject. "I want to join the Ample Power support forums." Without that subject line, your email will go into bit purgatory.
Send the email to s-u-p-p-o-r-t at you_know_where. Drop the hyphens, of course.
Spammers suck up a lot of everyone's time. Tell your government representatives to put some real teeth in anti-spam legislation.