It maybe related to the website itself.
If I recall correctly, to make sure that you have up-to-date files there are a few configs server to tell the browser to download it everytime. The reason behind it it's because of single page application and these sort of things, to make sure you download the newer version of the .js files. Maybe it's affecting your .swf aswell.
Have you tried a home made server, like, just installing Apache/TomCat and ask someone to try it?(LogMeIn Hamachi recommended to avoid headaches about Port Forwarding and Firewall Permissions)