Log in page glitch, no buttons. Warped graphics in worlds and hive. Unable to play. We've uninstalled and reinstalled
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This sounds like MCPE-109870

I have the same issue. Just getting the background but no login or buttons. It started right after allowing the update for Minecraft to download.
I have also gone through looking for driver updates, windows updates, and downloading them if there were any. I also tried deleting and reinstalling Minecraft. None of it worked.