UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3043.0 Safari/537.36

Steps to reproduce the problem:
1. Set your default audio device to a surround sound setup
(e.g. https://www.razerzone.com/surround#product_specs and enable virtual surround sound)

2. use a site / extension which support desktop sharing with "audio"

2.1. So we can reproduce this easily I hacked up a version of the webrtc-experiments desktopCapture-p2p:
     https://github.com/fpn/Chrome-Extensions/tree/master/desktopCapture-p2p

2.2. Install the extension
2.3. Click the Extension Button in the Chrome toolbar
2.4  On "Your Entire Screen" make sure "Share audio" is selected and click "Share"

3. {name: "TrackStartError", message: "", constraintName: ""}

Big error message comes up, if you set a breakpoint at the top of getUserMediaError(), you can see it is a TrackStartError

What is the expected behavior?
desktop sound is sent via webrtc

What went wrong?
{name: "TrackStartError", message: "", constraintName: ""}

Did this work before? No 

Chrome version: 59.0.3043.0  Channel: canary
OS Version: 10.0
Flash Version: 

Quite a few headsets (Razer, Logitech, ..) come with Virtual Surround Software which makes itself the default audio device - the same is true for some laptops with surround sound and of course real surround sound setups.