Bye bye, black bars. 
Now the YouTube player on iOS will automatically adapt to the shape of the video you’re viewing!pic.twitter.com/4jzJ6nPj4G
That's odd! Mind sending us a feedback report w/ these steps: https://goo.gl/WdI0BK ? Thanks.
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It happens to me too despite not seeing ads (youtube red)
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It usually happens when I exit the app while my youtube is still in full screen mode so when i go back into the app it won’t get out of fullscreen.
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