File will not download in IE 9 and up but works in Chrome and IE8

Be sure your post includes:

1. isomorphic/system/modules/ISC_Core.js?isc_version=v9.0p_2013-11-03.js

2. IE 11.0.9600 (not working)
IE 9.0.8112 (not working)
IE 8.00.7600 (working)
Chrome 41.0.2272.118 (working)

3 & 4. [c-10] ERROR ProxyHttpServletResponse - Error - getWriter() called on request that has already returned an OutputStream - stack trace for previous getOutputStream() call:
java.lang.Exception

6. window.location.replace("/pmu.jsp?src=USER&rand="+Math.random() + params,"","width=" + width + ",height=" + height + ",top=" + top + ",left=" + left);


The Error is present in every attempt weather the file is downloaded or not.