Have you tried clearing the browsers cache and cookies to check if that resolves the issue: https://goo.gl/TWzvWm ? Keep us posted.
@TeamYouTube why do i get this when i try and swap out my channel header or whatever you call it.. and when i load it its WAY TOO BIG you can't even read itpic.twitter.com/TC696ePBWg
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Yes and I have already contacted them, although I could not upload any screenshots. They never ever respond
End of conversation
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