title: Wordpress 3.8 403 when trying to create a new menu
body: <p>I have a (almost simple) wordpress installation, upgraded to 3.8 in the last days.
  Now I have to create a new menu and get a 403:
  "You don't have permission to access /wp-admin/nav-menus.php on this server."</p>
  
  <p>It's strange, I can access the default main menu and edit and change it with this file, but "/wp-admin/nav-menus.php?action=edit&amp;menu=0" does not work.
  Googled and found some who have the same problem but no solution.</p>
  
  <p>Ah, nav-menus.php is 644 in a 755 folder. </p>
  
  <p>I hope someone can help me...</p>