When I try to launch the game after updating, the loading screen come up, the progress bar fills quickly, and then nothing happens. The game just sits at the loading screen.
Started happening the first time I opened the game after the latest update and happens every time I launch the game.
From the Main Menu button (triple horizontal lines in upper left corner of screen), select Settings, click/tap Account and then Register Account from the screen that appears.
Once completed, your settings screen should look like this,