title: You do not have permission to do this operation
body: <p>I am a site collection administrator. When I go into SharePoint Designer 2010 I can see everything. However, when I edit a Master Page, or Page Layout, I get the following error:</p>
  
  <blockquote>
    <blockquote>
      <p>You do not have permission to do this operation. Ask your site administrator to change your permissions and then try again, or log on with a user account that has this permission. To log on with a different user account click OK.</p>
    </blockquote>
  </blockquote>
  
  <p>I have made sure that all the files on the site are checked-in/approved, and still no luck.</p>
  
  <p>All Designer options are enabled in Central Admin.</p>
  
  <p>Anyone have any ideas for things to look at, or try?</p>