When creating a new site in a MU configuration remember.
- Create a mapping in Settings-Domains
- In the wp_options table for this site make sure you have the correct value in siteurl and home
- Fix for "Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress."
- Put following line in wp-config.php just above the line "/* That's all, stop editing! Happy blogging. */"
define('COOKIE_DOMAIN', $_SERVER['HTTP_HOST'] );