Problems with Multi Site subdomain setup

Hi there!

I installed a fresh wordpress copy and enabled multisite option adding wpconfig.php lines and modifying .htaccess.

You can see the installation here: http://www.nflnews.it

After that, I added a wildcard subdomain through cPanel and used "Blogs And Users" plugin for creating a bunch of network blogs which are supposed to be reachable through domains such:

http://dolphins.nflnews.it
or
http://bills.nflnews.it

Unfortunately, I can't get the subdomains to work (I get a 404 error)

I double checked with my hosting provider, and they say every configuration seems ok (which is cool, but doesn't help...)

I must say that the installation IS NOT in root, but in a subfolder like /public_html/myaccount/nflenews.it and this is where my wildcard points to (this is also ok, according to my provider).

Do you have any hint? I'm stuck.

Thank you!