I was playing 1.16.100 and everything was working perfectly fine. 

I have previously never had any issues with Bedrock Minecraft on my PC.

I loaded into my Realm this afternoon and it asked me to update (After playing single player on .100) I opened the windows store and updated to .200.

Upon reloading the menu screen failed to show.  I re-installed the game, deleted all my settings including my local worlds, ran windows update and updated my graphics drivers.

None of this helped, I spoke to someone from the Microsoft Windows 10 team who tried as far as reinstalling windows for me.  This still did not work.

I did manage to load into the game by clicking where the buttons should be.  This caused textures to tear all over the screen, I have a screen shot bellow.

The update worked perfect on my Xbox and has even fixed a log in issue I was having on my sons tablet.  Just has mangled the textures on the PC version for me at least.