I am not a Flash person but maybe Egg or Acorn can spot the problem.

I would have done this using layers. But maybe it is six of one and a half dozen of the other.

The problem with either Flash or layers when you are working with such complex shapes is the co-ordinates are probably rectangles and this could be causing a small county not to be recognized.

I just tried this with a few map shapes as layers and even cheating a bit (using same color smaller shapes) two of the adjoining shapes appear when rolling over one of the shapes.

I'm going to move this to the Xara Flash chat.