I have been working with 3.0 beta 1 on my localhost and a Network of sites with subdirectories is working fine.
When I try using the Network feature on my production server on run into problems. I set up things the same way and got the Network features added, and created a second site. But when I try to go to the backend or the frontend of the second site in the sub directory I get an "Oops! This link appears to be broken." message.
Any one else have this problem?