UserAgent: Mozilla/5.0 (X11; CrOS x86_64 7978.66.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.91 Safari/537.36
Platform: 7978.66.0 (Official Build) stable-channel swanky

Example URL:
https://www.youtube.com/watch?v=xvQUiX26RfE

Steps to reproduce the problem:
1. Click youtube
2. Will initially say there's a "playback problem", wait for this to resolve
3. 

What is the expected behavior?
Youtube video will play but there will be no sound, regardless of video sound or laptop sound

What went wrong?
Sound won't play!

Did this work before? Yes Before last update

Is it a problem with Flash or HTML5? N/A

Does this work in other browsers? N/A 

Chrome version: 50.0.2661.91  Channel: n/a
OS Version: 7978.66.0
Flash Version: Shockwave Flash 21.0 r0

I feel like this must be due to the latest Chromebook update