Flash/xml/images not loading in Firefox or Safari

Hello to anyone who might help...
I am creating a completely dynamic flash site (example problem: http://www.playdown.com/testing/testing.swf) that's pulling all of its information from xml files. Everything was lovely until I tested it in Firefox and Safari. They don't load the images!?! I went into preferences for the browsers and made them as friendly as possible but still no luck. By visiting http://www.playdown.com/testing/testing.swf you'll see what's happening. It doesn't make any sense to me. Sometimes when I reload the page it works.

Do Mozilla and Safari have known xml issues?

Any help in this matter would be greatly appreciated!!