Can't switch worlds, load minigames, close realm; all stuck on loading screens.

I recently opened up a minigame for people to play on and now I can neither close the minigame or open any of my other worlds on Realms. I can't close the realm, either. Everything is stuck on the 'switching world' or 'Switching minigame' loading screen etc. Tried restarting PC/Logging in/out/reinstalling launcher/resetting wifi router; nothing works.