I have upgraded my wordpress MU 2.9.2 to 3.0 and got a problem when I am creating a new site. I use to be able to create a new site like this place.city.mydomain.com, but now I get this error: Missing or invalid site address.
I can create a new site like this city.mydomain.com but have problem when I am adding the extra "." between place and city.
What do I do to solve this problem?