Chrome and YouTube

I posted this in the Windows forum with no luck. Hope you guys and gals may have a Idea. Chrome will simply not play sound in SOME of the  youtube videos. They work fine in other browsers. I installed IE tab for chrome and that helps with the sound issue. 

Would love to get rid of IE tab, just no idea how to fix the issue. I have tried google. Nothing seems to work. 

Thats weird considering that Chrome is from google and youtube is run by google...I also don't understand why the IE tab would help with this issue. Do you have this problem when running Chromium?

Try this https://www.youtube.com/html5