WPMU isn't creating subdomains.

See:

http://a-cleaner-home.com/wp-signup.php

My host, Jaguar PC, set up dns wildcards. I specified that new sites be created on subdomains during installation.

But, wpmu just isn’t creating the subdomains. New user gets an email pointing him to his new site but…site doesn’t exist.

How do I go about troubleshooting this?