title: drupal-6 admin pages disappeared after importing content type
body: <p>After importing a cck definition the page timed out, since then there are several pages that I can't access and don't show up in the navigation, for example:</p>
  
  <ul>
  <li>admin/build/modules</li>
  <li>admin/user/user</li>
  <li>admin/user/permisions</li>
  <li>admin/settings/site-information</li>
  <li>admin/content/types/import</li>
  </ul>
  
  <p>Anyone experienced this before?</p>