I've installed the 5 Minute Installation in my server and turned it into a multisite.
Everything seems to be working but it does not create other sites. When I add a new site, everything seems fine, it sends me the email confirmation and the new website is shown in my top admin bar. But the site does not show up: the URL does not work (Internal server error http://obaiti.com/mais) and when I click in the admin bar link the Dashboard does not load (internal server error). The main website works perfectly.
In the Network Dashboard it does not account the new site as well. It says 1 user, 1 site.
I decided to run the same file in my localhost and it shows the exact same problem.
I downloaded the latest file at http://wordpress.org.br/