Some in other countries can't play those so that's the breaks.
Other found you have to disable that new Flash acceleration noted at http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html
Also your network admin may have blocked it. Ask them!
Bob
I can not get videos to play on IMBD website. I have Adobe Flash Player 10.3 plus have added IMBD.com to my allowed list. Can anyone help me.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic