BuddyPress.org

Dan-

Okay, I’m just thinking out loud, just going through the registration process.

As long as BuddyPress is installed and activated, is does not matter if your users register via the wp-signup.php form (which is found in WPMU) or the register.php form (which is found in BuddyPress). The extra fields from BuddyPress will show up on either form.

Here is where the data is stored:

The datum for “Full Name”, which is a required BuddyPress field, is stored in the table wp_bp_xprofile_data. The data for the “Nickname” field, which is the username if no full name is provided, the “First name” field, and “Last name” field, are stored in the table wp_usermeta. The data for “username” and “Display Name” are stored in the table wp_user.

So, here’s a question:

Did you at any point uninstall BuddyPress and delete the BP tables in MySQL? Did you delete any of the WPMU tables? Did you do either or both of these and then reinstall? If yes, did most of your students register before that time and then only those four register after a BuddyPress reinstall?

I’m just grasping at straws now. Perhaps someone else will have insight into this issue.