The sorting form is only available to users in the "Unsorted" group.
Because of how Xenforo (our forum software) works, all users are in a "registered" group and have a secondary group of "unsorted" applied to them if they're in no other groups. On ZetaBoards, "unsorted" was the default group on registration, but Xenforo is really built around the premise of a common primary group and then as many secondary groups to parse out specific permissions as you'd like.
So, the automation that adds the "unsorted" group to people in "registered" but nothing else runs every 20 minutes. Depending on when you register a new account in that 20 minute period, it could take a little before you can access the sorting form.
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