BuddyPress.org

Yes, to all of the above. Blog creation works. All user-side BuddyPress features redirect to the signup page. i.e. click on ‘news’ and you get sent to:

http://example.com/wpmu/wp-signup.php?new=wpmunews

Everything under ‘My Account’ and ‘Notifications’ is similarly affected.

From the Admin Dashboard, things work as expected.