New users not being added to root domain

So I have multisite and buddypress enabled, and it worked fine until I moved the setup to a new domain.

new user joins at mydomain.com, their account is created, and their blog is created at mydomain.com/user. The problem is, they are not being granted as a user under mydomain.com, so they cannot contribute on the root domain. Under /wp-admin/network/users.php, the accounts that are fine have their blog domain, AND the root domain showing under their sites. The problem accounts only show THEIR site under listed sites.

If I go to /wp-admin/network/sites.php, the accounts that are fine are showing as users under the root domain. The problem accounts are only showing as a user under THEIR site. I don’t know what happened, but I want ALL users that sign up and create a blog, to be added as a user under the main domain, so they can use features there and contribute, like events, classifieds, etc…

I have added links to a couple screen shots, I hope this helps. This is what I have in my wp-config file:

define('WP_ALLOW_MULTISITE', true);
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
$base = '/';
define('DOMAIN_CURRENT_SITE', 'www.mydomain.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

screenshots:
http://oi50.tinypic.com/inbmti.jpg
http://oi49.tinypic.com/2edz4ee.jpg

What have I got wrong here? I’ve been googling all morning for an answer, and can’t find this scenario.