BuddyPress.org

21cdb-

Do you have two different accounts on bp.org?

As far as the redirect loop question, it could be caused by many things. So, a few questions:

1. Did you install WPMU as a directory or subdomain install?
2. If a directory install, is it in root or in a subdirectory?
3. You were having install issues beforehand. When you finally got this to work, could there have been old, incomplete install data leftover in your DB? Or, did you install into a fresh, new DB?
4. What errors are you seeing in your server’s log files?

I did a quick Google and here are two links that explain a couple of possible causes:

https://mu.wordpress.org/forums/topic/9252/page/2

http://bradleyland.net/2009/04/wordpress-mu-redirect-loop-during-install/