Respond.js not working cross domain

I'm having difficulty getting Respond's CDN/X-Domain Setup working.

I started off serving all assets from the CDN:

<link rel="stylesheet" href="http://cdn.example.com/css/main.css?2013012401">
<script src="http://cdn.example.com/js/modernizr-2.6.2.min.js?2013012401"></script>
<script src="http://cdn.example.com/js/respond.min.js?2013012401"></script>

In theory this should work, since all assets are being served from the same domain. However IE8 didn't receive Media Query support like it should. So I investigated Respond's CDN/X-Domain Setup and amended my <head> section to this:

<link rel="stylesheet" href="http://cdn.example.com/css/main.css?2013012401">
<script src="http://cdn.example.com/js/modernizr-2.6.2.min.js?2013012401"></script>
<script src="http://cdn.example.com/js/respond.min.js?2013012401"></script>
<link href="http://cdn.example.com/respond-proxy.html?2013012401" id="respond-proxy" rel="respond-proxy">
<link href="http://cdn.example.com/img/respond.proxy.gif?2013012401" id="respond-redirect" rel="respond-redirect">
<script src="http://cdn.example.com/js/respond.proxy.js?2013012401"></script>

When that also failed, I amended my <head> section to this:

<link rel="stylesheet" href="http://cdn.example.com/css/main.css?2013012401">
<script src="http://cdn.example.com/js/modernizr-2.6.2.min.js?2013012401"></script>
<script src="http://cdn.example.com/js/respond.min.js?2013012401"></script>
<link href="http://cdn.example.com/respond-proxy.html?2013012401" id="respond-proxy" rel="respond-proxy">
<link href="/img/respond.proxy.gif" id="respond-redirect" rel="respond-redirect">
<script src="/js/respond.proxy.js"></script>

I'm not sure what else I can try really to get this to work. It works fine in a local Dev environment that's not using the CDN, but in the Live environment this Respond.js CDN/X-Domain Setup is not working. Could it possibly be related to the cache-buster query string added to the CDN assets? Why is my original example not working when all assets are being served from the same domain?

Edit: Here's the error that's thrown in IE8

This issue was caused by the respond-proxy.html file reference containing a query string (respond-proxy.html?2013012401). Removing the query string from this file causes the above implementation to work.