Hello,
I'm using wordpress-mu-1.3.3,2 on FreeBSD. I install it, setup a user, all works well. I go too: http://localhost/wordpress/ and I see links to log in or create a new blog.
Here's the rub.
I log in as the admin account, I change the presentation too WordPress Classic, now when I go too http://localhost/wordpress/ I see the blog for the default user, and can no longer view the same page with the login and create new blog links (even after logging out).