My webapp with fusioncharts works well in Firefox, but not in Internet Explorer. The problem isn't that I can't get the XML data (the Pragma and Chach-Control header, when you get a "Error in loading data") because I can load a Excel file with html data. I get a Movie not loaded error instead, like if that IE can't load the swf file.
I tested the application on another computer with https on IE and that doesn't work, but it do work on regular http in IE.