If this has already been identified then I apologise. I can access arrse fine as long as I delete all cookies or I log out before I leave the arrse site. Also when i log in it always takes two attempts. First attempt gives either a blank page or an error. I press refresh and send form again then it all works fine. If I then leave the site and try to go back (without deleting cookies) I get a fatal error. This doesn't happen if i return immediately. I am not sure how much time must pass before this symptom occurs. Any other mac users having this issue?