I have been working on this website for the past week with no issues. I enabled the wordpress theme editor so I have been doing MOST of my work within the site admin.
I currently only have two users, myself (admin) and a test (subscriber). I also have two blogs.. the main wordpress MU site and a sub blog for testing.
When I log into my main domain using http://bscwebinar.com/wp-admin and use my admin username and password, I see only the basic dash and NOT the MU dash with the site options and all of that stuff.
I also can not install plugins or anything.. This happened to me before when i used MU for the first time with another domain and I don't really know how i fixed it.
I have tried to remove the cookie and refresh but still no go.