I just bought the game and tried it through Amazon Luna. I can reach the main menu, but when I enter Campaign> single player it gets stuck on an empty screen with a background and nothing more. Not a loading sign or anything, just the menu music and the background.

Edit: I've seen on a video the there should be another menu after this with "prologue" and a chapter selection, this is missing. Also when loading the main menu says something about the data being corrupted.