It looks like the most recent Flash Player update has caused these videos to not work. I tested the Starter Kit this morning and it worked until i updated to the newest Flash Player version.
However, i viewed the swfs directly within my browser and everything worked fine. When i clicked the Mac 10.5 button, it opens this page in my default browser. mamp_for_mac.php.
This may not work if you are not running the swfs from within a browser and have a standalone Flash Player instance running. If you haven't already tried, i'd suggest dragging the swf into your browser to start playing it.
I will keep you posted when we've determined a workaround regarding the Flash issue.
Thanks for your patience.