title: __dopostback undefined in IE 11 on windows preview 8.1
body: <p>I have an ASP.net 4.0 application running on Windows Server 2003. </p>
  
  <p>I am running Windows 8.1 <em>preview</em> with IE 11 and I am getting the </p>
  
  <blockquote>
    <p>__dopostback undefined error. </p>
  </blockquote>
  
  <p>I have already tried all of the suggested hotfixes, kbs, and nuget packages and none of them work. I can add the site to the compatibility view settings and everything works fine. I googled but I cannot find any updated browser definition files for IE 11. Has anyone seen updated files or know what I can do to solve the problem. </p>
  
  <p>Like I have said I have already tried everything from this <a href="http://www.hanselman.com/blog/BugAndFixASPNETFailsToDetectIE10CausingDoPostBackIsUndefinedJavaScriptErrorOrMaintainFF5ScrollbarPosition.aspx" rel="nofollow noreferrer">Scott Hanselman's blog article</a>. So please do not post that as a response. </p>