UCX WebRTC is not supported with the latest version of Google Chrome version 57 or higher. We are currently working on a resolution and will provide an update as soon as possible.
In the meantime, if your Chrome application has already been updated to version 57, then you must roll-back the application to version 56 or earlier. You can obtain an earlier version of Chrome here.
You must also disable automatic updates for your Chrome application. Instructions to disable automatic updates can be found here.