Microsoft Account not working

Since the new update, I have not been able to use my Microsoft account, including the skins, texture packs, and worlds associated with the account. This is very frustrating, and I have tried many attempts to restart the console and the game. 

The marketplace is also down, and says that the session is "invalid" and suggests a game restart, which of course doesn't resolve the issue. The game also crashes continuously,  but I haven't really been able to play it anyway if I want to use a skin or item associated with my account.