WHen I create a new page in my gamebook, and name it (easy(Home)) and hard(Hospital) It won't let me and say its a invalid element name but when I put just "easy" or just "hard" It says "Invalid element name" bu it still works when I play it but my background always changes to white and my foreground to black.

I can create pages called "easy" and "hard" (no quotes), and it works. Can you post your game so we can see what you've done?