title: "This is an invalid webresource request" no longer an issue when resetting IE8 to default settings
body: <p>Our production server has been logging the dreaded "This is an invalid webresource request" randomly. We use a lot of Telerik controls in this application and the issue would manifest itself to the user as missing background images for Telerik controls. I was able to reproduce the problem on the production server, but not in development.  </p>
  
  <p>I was able to solve the problem locally by resetting my instance of IE8 back to default setting, details in this <a href="http://support.microsoft.com/kb/318378" rel="nofollow">acticle</a>.</p>
  
  <p>So my question is what IE setting would possibly cause this and how can I avoid this problem in the future?  Thanks</p>