Just downloaded A*. I have used it many times before, without any errors, but this time Unity threw that to my face. I haven´t altered any of the code and I don´t even have anything else than AstarPath and minebotAI in the scene from those scripts contained in the A* pack. None of my own scripts alter or interact A* scripts in any way.
If you need some extra info please ask, it´s late in here so can´t really think.
Oh! Yes! Forgot to mention, it doens´t throw any errors during run in the editor. That pops up when I try to compile.