BuddyPress.org

John, I copied your web.config file to my server and am experiencing the same problem. I have found several others here on buddypress experiencing the sdame thing and it seems thye are all hosted on Godaddy as I am:

Here (this describes my problem exactly)
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/404-flashes-then-redirects-fine-when-creating-groups/

I have seen others as well.

Any further thoughts?