Minecraft stuck on a black screen when i open it

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I had this same problem and I found a solution!

Basically changing the anti-aliasing setting from the default version messes something up and you can't open the game after changing it.

I typed in %LocalAppData%\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftpe into the Windows search. Then I opened the options text document. I changed the gfx_msaa:1 into gfx_msaa:4 (making the anti-aliasing setting back to default) then saved the document and closed it. After that my Minecraft loaded properly!