This situation is absolutely driving me crazy. I'm trying to edit a WP page. When I click Update, my screen goes blank white in Safari. In Firefox, it goes white with a message about no server connection.
Also -- and this seems to be a related issue -- my Preview Change function is hanky. When I click Preview Change, I get a blank white screen. I have noticed that the URL in the case ends in post.php, with no info following it to indicate the actual number.
Sometimes when I click View Post, I can actually see the edited page. At other time, I get a blank white screen.