Safari (and others) video problems

[METOO999]

I'm having problems viewing certain videos. They just don't load at all.

(supposed to be about the new Nook ereader)
http://cnettv.cnet.com/new-nook-e-reader/9742-1_53-50105359.html?tag=cnetRiver

And this. It just displays a camera icon:

http://www.engadget.com/2011/05/24/barnes-and-noble-announces-new-nook/

I tried the latest Safari, Chrome and Firefox. I also tried disabling Adblock. Youtube videos work fine.

I'm on a black Macbook with Snow Leopard latest updates. I've attached some screenshots.