Some time recently, Twitch player stopped working in CoherentUI. I embed it with the url http://player.twitch.tv/?channel=
<channelname>. Just a black screen with the Twitch logo in the bottom right. Up until recently, it worked fine as long as you had the Flash NPAPI system plugin. But, it no longer works even if you force Flash mode by adding &flash to the end of the URL.
Looking in the console, a couple errors are thrown. The first is "Uncaught Error: Uncaught in promise: TypeError: Cannot read property 'get' of undefinedTypeError." The top of the call stack is e.detectionTestCallback. Perhaps Coherent browser is no longer being detected as a valid browser?