WordPress MU

Hi,
I have installed wpmu in my wpmu folder and it works well. but when I go to the site: http://domain.com/wpmu , then It shows nothing and goes back to http://domain.com
But when I go to http://domain.com/wpmu/ ( with a slash at the end) it shows the website. what is the problem?

Don't know, but I am experiencing the same problem...please post back if you find an answer and I'll do the same.