Firefox vs IE, BUT flash only !?

Hello people, Im walking into a WEIRD problem about Shared Objects.
I made a flash movie (simple one, just to tell people about the shared object thingy), but there I saw something new, when I look at the swf in FF, the cookie dont work, but in IE it workes 100% perfect.

if you look at http://vintage.sitemasters.be/tutorials/flashCookieTutorial/positieCookie.swf , in IE or FF, you will see the problem, in IE it remember the position, but in FF it starts back in the middle…
(the text in the swf say “drag the ball, and refresh page”)

anyone ? plzzzz… beqause this is not an m$/other thingy, but 100% flash.