A possible Fix for your black screen bug.

[Hercule007]

About the Bug: I had the same bug with a full screen post process when I start my game in windowed in Unity.
The dirty fix I've got is in a monobehaviour :
   void Start ()
   {
      if ( !Screen.fullScreen )
      {
         Screen.SetResolution(Screen.width, Screen.height, Screen.fullScreen);
      }
   }

I don't know if this is the same bug, but in case it is.
It's probably a texture or something like that, which isn't init properly. I don't think there is a proper fix without asking Unity guys to look into it.

PS: I'm reading your Game Design book, and there is very good ideas.
I will try your game soon !!