I've recently notified that I have the same issue. I've got a less reddish strip on the top part of my screen. I think it doesn't have anything to do with youtube! Because it is not true in my case! I mean it's aligned with my youtube borders neither in portrait nor landscape modes. The weirdest thing about my issue is that I can see a back arrow at the left corner of my screen. Right on that part of the screen which is less reddish. I can also recognize a three-vertical-point icon(like typical setting/more icon in Android devices) on the right corner of my screen!!! They are always there, regardless of any apps that would be opened or not. I can even totally see them when I'm on my home screen. It's crazy!!!!!
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