I had a mu install running with 1 dozen or so sub.domain.com blogs going. After moving the site to a new host and upgrading to latest wpmu.. the existing subd. no longer work.
I can create new ones like test.domain.com and it will work fine, but when try to access an existing sub.domain.com it will not resolve.
I am thinking it is some setting in the db.. where new subd blogs are getting set correctly and working, but old/existing subd blogs are not.
Thoughts?