Total newb working on a map building engine

I think it lies with the first call to CreateWorld(). I'm still looking at it.

EDIT:
Yep, when I remove the very first call to CreateWorld() (after Icemap=LoadImage...) there is no error. There is no need to call the function as technically CreateWorld() follows the program flow from StartWorld().

However, test it yourself to see if this is where the problem lies - coz, for me the program just ends naturally without any erros, but I see no graphic output.

EDIT:
Personally, I wouldn't put StartWorld() in a function and I wouldn't recall it the way you do - you are duplicating.