Thanks for reaching out. We've seen similar reports and are currently looking into it.
@TeamYouTube for some reason when I try to update my channel banner it will give me this pop-up.pic.twitter.com/wY41R6x0uV
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.