I am having the same error appear only on machines running IE 6 who installed the latest Service Pack from Microsoft. Those that have not installed the service pack work fine, and those who are running other broswers or even IE 7 work fine. Just IE 6 with the latest Service Pack.
"The XML page cannot be displayed
Cannot view XML input using style sheet. Please correct the error and then click the Refresh button, or try again later.
Parameter entity must be defined before it is used. Error processing resource 'http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd...
Any help from the developers would be very welcome!