4 December 2009 at 4:33pm
(Last edited: 4 December 2009 4:35pm),
This is a content issue being thrown by your browser (not SilverStripe), your page is being generated with an XHTML doctype but the content being generated isn't fully compliant. It should be outputting the html entity instead of a raw ampersand
Firefox 3.5 and IE 8 will both choke on this. You need to fix the markup or change your doctype to HTML transitional, unless anyone has a better solution?