jQuery.getJSON not working properly in IE8 with gdata json-c. Why? [duplicate]
I can't tell you if it's an error in jquery or IE, but it looks like the XDomainRequest fails in IE. Add this to the URL:
&callback=?...so the response will be handled as jsonp.
Edit: It looks like Microsoft's XDOmainRequest is not implemented in jQuery, so you can't run Cross-Domain-Requests in jQuery using IE(except jsonp)