Update on July 11:
Account creation using OpenID is currently disabled due to problems with the OpenID plugin. New wiki users wishing to create accounts should use the ‘Log in / create account’ link and request an account; your request should be dealt with within 24-48 hours. Unfortunately, due to spammers and others creating bogus accounts, we have to had to put protective measures in place.
Please email the GMOD helpdesk if you have any problems or want to expedite the creation of your account!
Posted to the GMOD News on 2013/07/10