Yep, it is broken. It is supposed to be working.
MC still has a little memory and network activity, so not completely dead. But it isn't responding to Windows, so effectively dead.
YouTube sign in is no longer working in MC anyway, so I just use a browser these days, because I want the personalised experience. I need to log in for that.
Reference:
https://yabb.jriver.com/interact/index.php/topic,124329.0.htmlYouTube still works in Standard View (sort of), just without being able to sign in.
PS: The trailers function just needs to download the trailer video, for which it uses the free youtube-dl.exe program and the URL from TheMovieDB which is saved in the [Trailer] field by the "Get Movie & TV Info" function, and then play the video. So no sign in required, and no App interface. Much simpler.
PPS: MC still doesn't return to the YouTube main page after a video is played, which is annoying. It has been doing that forever, when you select the "Play the file inside the player" option to play through the MC engine. That's why I said it sort of works in Standard View.