title: Glyphicons and other icon fonts don't show up in Internet Explorer after page refresh
body: <p>I'm totally stumped on this problem (the app in question uses Bootstrap and Backbone):</p>
  
  <ul>
  <li><p>when you first load the app after logging in the glyphicons and other icon fonts show up on the page fine.</p></li>
  <li><p>on subsequent page loads they don't show up at all. But you can log out and log back in and they show up again.</p></li>
  <li><p>it only happens in Internet Explorer. Chrome/FF/Safari are fine.</p></li>
  <li><p>it doesn't happen if you go to a part of the app that doesn't require authentication</p></li>
  </ul>
  
  <p>The same part of the app with (top) and without icons (bottom):</p>
  
  <p><img src="https://i.stack.imgur.com/B9JHs.png" alt="with icons">
  <img src="https://i.stack.imgur.com/IBwXo.png" alt="without icons"></p>
  
  <p>Unfortunately to see the problem it requires authentication so here is that info (you will be redirected to the app):</p>
  
  <p><a href="https://voicethread.com/login/" rel="nofollow noreferrer">https://voicethread.com/login/</a></p>
  
  <p>username: ietest@voicethread.net</p>
  
  <p>pass: orange4</p>