Everything works correctly up until I reach the "Single-player" page. When I try to click on a world, nothing happens. The "play selected world" button doesn't light up, and all I can click on are the "create new world" and "cancel" buttons. I've tried turning my computer off and on and re-downloading the game, but nothing has changed.
What happens if you do create a new world. Does that work normally? Can you enter it more than once?
I don't know that I've ever heard of this one.