Recently bought a chrome cast dongle which is really great and I bought this for watching youtube and my local language songs. Recently there are lots of application/extensions have been developed. One of the interesting thing I found was Plex to stream the local video or any video you see in the browser using the Plex it Pins. up to now its all easy to set-up and follow the sample instructions using the standard document like installing media server etc.. After all this setup I was not able to see the chromecast icon to cast to TV from the queue.
Its Simple please check your router firewall rules and allow the connections in the inbound rules.
Note : There are loads of articles explains about reinstall app, browsers all things but its just firewall.
Enjoy watching from sofa with a Somasa