<script type="text/javascript">
//<![CDATA[
if (typeof(Sys) === 'undefined') throw new Error('ASP.NET Ajax client-side framework failed to load.');
//]]>
</script>
Sys
is undefined and the error is being thrown on an ASPX page but only in IE10. Opera, Chrome, FF, and Safari all work fine! I've dropped IE security to the "Low" position in case it was a permissions issue of some kind, but no joy.