Many of the videos are unable to play (it gives an error). All those seemed to be working yesterday. My flash player is working fine and I did watch one video just now.

Here is one of the video links:

http://www.chess.com/video/player/how-to-play-the-queens-gambit-ii

Can someone from staff pls check and update.

Indeed, I'm having the same problem. You say "some" videos don't work. May you link to one that does work, so I have something to watch before calling it a night? 

Well, i corrected that to many just now as many videos do not work. Danny Rench's Panov attack was working sometime back. 

I just saw your forum topic which you had already created for this problem.

http://www.chess.com/forum/view/community/chess-videos-quotvideo-stream-not-foundquot?lc=1#last_comment