title: Wordpress Backend some Pages without Content
body: <p>on some Backend Pages I don't get any Content. This only appears at default pages like (articles, pages, etc.)
  Deactivating all plugins and the white space problem in wp-config.php didn't resolve my problem. Someone else an hint?
  PHP Version is PHP 5.4.23-1~dotdeb.0.</p>
  
  <p>Best Regards,
  Manuel</p>