Youtube Videos not playing on any device.

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So a strange thing has happened. Most youtube videos will not play on any of my devices, except chrome browser on PC. None of my firesticks will play the videos nor my TV app. All I get is a black screen. I have reset and reinstalled the apps and nothing has worked. So I am thinking it must be a problem with my account. Any tips on how to fix this?

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Well it seems like this was a worldwide issue affecting some people with videos that have front loaded adverts. Those without played fine, those with hung on a black screen. It seems Youtube has fixed this after about a day. I have to say their communication over the issue was terrible.