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I think you're missing the Chromecast button on the YouTube page. You shouldn't have to mirror the tab to fling YouTube to the TV.

Mostly I use it for Netflix, Google Play Movies & TV, and Plex.

Also if you have an Android or iPhone the native application on either device will have the Chromecast icon to fling the video. It's the same icon in Chrome (and maybe other browsers? I'm not sure) to fling from your computer.

Try using the native apps for chromecast for streaming content as opposed to streaming the chrome tab. Youtube has a native chromecast app.

Definitely not. Since Chromecast is sending audio and video over the same connection (HDMI), this is likely a problem with your TV or the like. Do you have a complicated Home Theater setup?