Flash not working at a certain site

Got the latest version of flash, and it's working pretty much every site I go to. But, at this site:

http://www.neave.com/imagination/

It's telling me that I need the latest version installed. Some of the other links on neave site work perfectly fine, but the imagination one, and a few others don't.

Don't know if this is the sites fault or Firefox Portables. But in my system install of Firefox 3, the above link is working. Internet Explorer, and Opera also display the site fine.

I've tried copying the flash plugins files over again, and even tried different locations to put them in, but it still doesn't work. I don't have JavaScript disable or any extensions that block that sort of stuff.

Can someone take a look at the link, and tell if it works for them?