Flash slideshow won't play in Safari

I’ve created a Flash slideshow with XML in Flash CS4; it’s located at http://www.mooneyart.com/mooneysmodules/index.html. I’ve tested it on a pc in Firefox, Safari and IE and it plays just fine. I’ve also tested it on my Mac in Firefox and Safari, and for some reason it won’t play in Safari on my souped up iMac, but it plays just fine on my wife’s Macbook in Safari. I’m stumped! My wife’s running Safari v.3.1.2 and I’m using v.4.0.2.

Any insight from anyone on why it won’t play in one browser on one machine but plays perfectly fine otherwise? Do they keep breaking Safari with each upgrade?