Comment: Problem Installing 7.6

I have purged all cookies from within the browser, then have surfed your site without any problem. Actually YACS does not rely so much on cookies. The main one is the PHPSESSID which is managed directly by the PHP run-time. The other cookie you mentioned is only used to avoid logins, no more. The white screen syndroma you are experiencing cannot be related to cookies, in my opinion. Usually this is coming from some internal error on server side due to an ilegal call or similar. Have you asked your ISP to show you the Apache error log?