I’ve had trouble watching some of my favorite flash videos on Revision3. com and Cnet.com, but never on YouTube. The solution was a setting in Flash. Right click on the flash video and do this.
Under Flash Global Storage Settings, you have to click the box
which says “Allow third-party flash content to store data on your computer.”
While you can also set the storage level to Zero and click the box which says, “Never Ask Again,” they will ask again and bug you to allow them to put their files on your computer.
It’s a shame they demand to install third party content on your computer before the video will play, but that’s the price to play on their ball field. Hopefully they’ll consider getting rid of this requirement.