title: Silverlight / Deepzoom weird flashing rectangle bug
body: <p>I just launched my website - <a href="http://blackspike.com" rel="nofollow noreferrer">blackspike.com</a> - under the 3D tab on the homepage I've put a deepzoom collection in there. A friend has noticed that if you pan down and to the right there's a weird psycadelic flashing rectangle.</p>
  
  <p>I've tried recreating the collection, and reuploaded and there is nothing in the composer project to suggest anything out of the ordinary. </p>
  
  <p>Has anyone seen a bug like this before, or have any ideas how to fix?</p>
  
  <p>Thanks in advance!</p>