Creating a new site in WP MS

I am trying to use the User Registration addon to create a new site in WP MS. It seems that the addon adds the newly registered user to the main site, but the WP function wp_install_defaults() does this as well. The result is that the newly created user shows up in the table that lists the sites (Network admin->Sites) two times. However, the new user does NOT show up 2x in the user table (Network admin->Users). I have worked around this by creating a custom install.php in the wp-content folder that replaces the WP function wp_install_defaults(), and then commenting out the lines that duplicate the user in the site table.

Is this a bug in the User Registration add on? It would seem that if I'm right about the WP behavior, the User Registration addon shouldn't add the user to the sites table. Or is this the intended behavior?

Also, I posted a question here that has gone unanswered:
http://www.gravityhelp.com/forums/topic/creating-new-sites-in-a-network-after-taking-payment

I'm no longer interested in getting answers to all of those questions, but I am still wondering how to get the numeric site ID of the site created by the user registration add on. Does anyone know where I can find that info?

Thanks, David. I will send you an email.

As for clarification of the issue, the problem is that in the usermeta table, there ends up being 2 capabilities for the new user on the main site, such as {prefix}_capabilities. The {prefix}_{siteid}_capabilities (ie, the new site) just has 1 entry as administrator. For the main site, there are 2 capability entries for subscriber, which is the role consistent with my setting, but there should be only 1.

I suspect that the standard wp function wp_install_defaults() adds the capability for the main site when a site is created, and perhaps the addon does the same thing, resulting in a dupe.

{prefix}_user_level is also duplicated, but no other fields in usermeta appear to be duplicated when a site is created.

When the capabilities are duplicated, the user ID appears 2x on the site list, even though the user only appears 1x in the user list.

Does that clarify things?

David, I tested version .20, and after creating 2 sites, I can't reproduce the error, so it seems this was resolved between version .15 and .20.

Thanks for your assistance.