UserAgent: Mozilla/5.0 (X11; CrOS x86_64 8350.60.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.85 Safari/537.36
Platform: 8350.60.0

Example URL:

Steps to reproduce the problem:
1. Play audio (eg from Spotify, Hulu, Youtube...)
2. Mute audio by pressing mute button on keyboard
3. Press mute button again

What is the expected behavior?
The audio should become un-muted.

What went wrong?
The audio remains muted. The key is not working as a toggle between muted/unmuted, it's only acting in a single direction unmuted-->muted.

Did this work before? No 

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

Does this work in other browsers? N/A 

Chrome version: 52.0.2743.85  Channel: stable
OS Version: 8350.60.0
Flash Version: Shockwave Flash 22.0 r0

In order to un-mute audio, you must press the "Volume Up" button, then press the "Volume Down" button to return the volume to what it was originally, before you muted it. If you mute the audio then press "Volume Down," it drops the volume all the way to 0, and you have to figure out a comfortable volume all over again. It's inconvenient.