It looks like Youtube has a counter on the videos when they are used on other sites. When a number of "hits" have been reached, it makes them unusable. I'm afraid the only way of viewing them is to use the live links I provided. I'm sorry I cannot rectify this situation. On the bright side, it's easier to post Youtube videos now, by using the "tube" icon on the left bottom row, when your in the post mode window, you can enter the whole URL instead of half of it. Just C&P the address between the youtube "tags"