We have installed WPMU and are testing the user registration process. When a new user is directed to the sign-up form, he is sent to the site admin sign-up, and is ultimately associated with the admin blog, rather than the blog from which he clicked on the registration link. For example, say the admin site is called myblogs.com, and the user wants to join blog1.myblogs.com. The register link correctly shows "blog1.myblogs.com/wp-login.php?action=register" but the user is sent to "myblogs.com/wp-login.php?action=register" and is then made a member of the admin site, rather than blog1.
How can we ensure that the user gets assigned to the correct blog?