We've seen similar reports and are currently looking into it. Appreciate your patience in the meantime.
@TeamYouTube hey guys, I keep getting a dispatched monkeys message (500) when I try to change my channel watermark. I managed to remove my existing one but now I can no longer upload a new one, because I keep getting 500 Internal Server Error 
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Iskren here, but you can call me E!
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