Youtube videos will not play?

I have the mid-2010 MBP 15" notebook running Snow Leopard. Earlier today I was able to play videos on Youtube. Now I can't. I only get a black box without play/pause toggle controls when cursor is moved. The only significant change was an update Apple pushed for Java today. I can play videos on Hulu and other flash-based video sites. The video doesn't work on Safari, Google Chrome, or Firefox. I provided a screenshot below if it helps. Thanks again!

Alright I fixed my own problem. I had to clean out the cache and/or browsing history in all of the browsers. For some reason the videos will not load until the user does so.

Hopefully this thread can help someone in the future.

Good call you made there : 80% of computer problems can be solved by reboots or cache resets.

youtube does not work

I have run into the same problem as the original poster with youtube not working. It worked in the morning and now it does not work.

I have uninstalled the old flash player and installed the new version. It did not fix the problem. i then rebooted the computer, that did not work either. I also cleared the cache and internet history from the browser, and that did not work. Please help!

I have the same problem. My computer says I have the latest flash player. Each time I try a video it tells my I must upgrade. I have done this several times with the same results. This sounds like an adobe problem.

cannot play YouTube videos

After a recent system update (I am now running 10.8.3) I cannot play any YouTube videos.

I have tried FireFox, Safari, and Chrome... emptied cache's, updated to latest stable version of Flash, even tried the Beta version of Flash, but nothing has worked.

Still no YouTube video's.