This appears to be a bug with loading XML into a flash object in IE over an SSL Connection. The following blog post has more details:
seams Microsoft is aware of this:
they recommend the following fix:
1. In Internet Explorer, on the Tools menu, click Internet Options. On the Advanced tab, clear the Do not save encrypted pages to disk check box.
2. Make sure that the server does not send no-cache headers.
3. In IIS, in the Microsoft Management Console (MMC) snap-in, right-click the XML file. On the HTTP Headers tab, turn off the Content-Expiration option.