About March 1, it appears new users were not notified about their passwords. As a result, they were unable to use the system. I just received a PM that this problem has been fixed "temporarily," whatever that means. I just ran a process I can run to check if new users are using the system, and it reported that two users that obtained a userid today by the system's time successfully logged on.
For those of you that created a userid in March or April and never received their password notification, try using this link to reset your password. Any of the more than 250 userids created in March that have not used the system by May 1 will be deleted.
Good luck.