WordPress MU

After upgrade my subdomain based MU, it works only home page for each subdomain, but all posts redirect to signup page/

I have noticed that all new users and blogs created after upgrade are subdirectory based and works well.

I want to stay with subdomain based installation, there are many posts.

Please help, some urgent.. Thank you very much

I ended up deleteing the whole files and reinstalling.

Just re-use your database and everything should be fine.

I have done it serveral times, all blogs (subdomains) work, but all posts gives error 302 and automatically redirect to signup page. I am going nut three daya