I've heard that sometimes videos disappear because a copyright owner has complained, and it gets yanked.
I've had the experience that after I play one of the links on our board, from YT, suddenly there is a blank white box where the video used to be. Then I go someplace on the board and come back, and it works again. Not always, but sometimes.
Other times, I've posted what I know is a good link, and the sucker just won't work . . . and yet I can go through the exact same motions ten minutes later, and suddenly it works.
Go figure! We all know how "reliable" computers can be 
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Chester 
