My book pages are wrong sometimes?

Unity changed something internally in the 3.5 update that meant texture changes happen in a slightly different order. If you are using Unity 3.5 or greater and see pages flicker or wrong pages displayed when using the Book script you should turn on the ‘Late Update’ option on the Modify Object components of your pages, this will cause the mesh to be updated after the Unity Update phase and after the book texture swaps have happened internally.