title: IE Compatibility mode issue on Intranet pages (only internal, works fine externally)
body: <p>I have a strange, and frustrating problem that unfortunately I can't even demonstrate for reasons that will become clear...</p>
  
  <p>I am using a 3rd party component as a HTML editor / file uploader on my Intranet:
  <a href="http://www.dmxzone.com/go?18424" rel="nofollow">http://www.dmxzone.com/go?18424</a></p>
  
  <p>For some reason, it wasn't working correctly and then I noticed that IE was switching to compatibility mode automatically when it viewed a page with this component on it. If I hit F12 and switch back to IE9 or IE8 mode, it works fine. It also works in Firefox and Chrome etc.
  I contacted the developers who were very helpful, but it turns-out if I make the script available externally on the Internet, it works. This problem only occurs if viewed internally, on our network, so I guess it's not their fault.</p>
  
  <p>If I view the web page on the web server itself using <a href="http://Localhost/page.asp" rel="nofollow">http://Localhost/page.asp</a> it works whereas if I use <a href="http://theservername/page.asp" rel="nofollow">http://theservername/page.asp</a> it does the compatibility mode switch and fails.</p>
  
  <p>A little research suggested using the following meta tag would prevent this behaviour:</p>
  
  <pre><code>&lt;meta http-equiv="X-UA-Compatible" content="IE=Edge"/&gt;
  </code></pre>
  
  <p>but that doesn't work. Neither does disabling the 'automatically recover from page layout errors with compatibility view' option in IE (which we could do at a push, as this is only an Intranet application.)</p>
  
  <p>I've tried using Fiddler to see if the page or headers are any different when viewed on internally but I can't spot anything. The Intranet zone is 'trusted'.</p>
  
  <p>We use a proxy (Webroot) for our web-filtering, which I'm suspicious of but that could be a red herring. </p>
  
  <p>If anybody has some suggestions (other than don't use IE :p ) then I would be very grateful</p>
  
  <p>Thanks.</p>