Indeed, it has come to my attention that several people is experiencing issues while playing videos on YouTube while using Google Chrome. From what posts and forums says, it appears to be affecting users that have a previous generation of MacBook, from 2 to 3 years old.
Sources says it has to be related to the latest Adobe Flash update, which affects Chrome only. It works fine while running Safari, Firefox or any other browser. We have sent feedback over to the Chrome guys, and we received information about them addressing the issue. However, they have no ETA or have officially heard from them as of today.
If you are experiencing issues or have figured out a way to resolve it, please send your feedback over to the Google Chrome team from the "Help" menu from Chrome. Or let me know via Twitter @viNnyb0ii