I just installed multisite tonight and tested a registration to make sure all was working, which it's not.
I'm using HostGator reseller hosting, followed their steps to add a wildcard record, edited my htaccess and wp-config files using the info provided in the wp installation.
I registered a new blog successfully, got the activation email, but when I clicked the link in the email, I got an error (problem loading page - page not found). The activation link looked like subdomain.mydomain.com/wp-activate.php?key=829d7622d2c6fab5
when I removed the subdomain from the link, it worked and said my new site was activated and gave links to the site (subdomain.mydomain.com) and the dashboard. Neither link works. They both say Page Not Found.
What have I done wrong? I don't have any plugins activated, this is a brand new install and creating the new subdomain blog was the first thing I've done since the install.
I'm at a loss here, and I don't know much at all about multisite, so please go easy on me :)