OK.
I started a completely new installation of WPMu 2.6 R.C.1 on a mediatemple (gs) account. The blogpeoria.com domain are now pointing at the appropriate nameservers.
I ran the installation script with the username, database, passwords, host name etc. I am using subdomains. It's mediatemple so the wildcard is enabled.
I clicked on the login link on the "installation successful" msg and got a login page devoid of the style sheets.
I tried to login, but immediately received the "page cannot be found" message.
The files and folders seem to be there.
I have not yet uploaded any files or databases from my previous installation.
Query: What should the permissions for the wp-config.php page be set to. It's NOT 755.