Hi Paradox, you make it insanely difficult to submit a bug report, so if this is in the wrong forum I have no regrets. Anyways, here's a save of a game I'm playing, try to move the 4 stack from Brittany to Ireland, you will most likely freeze. Hope this gets fixed.
https://drive.google.com/file/d/0B7xHQPjEw22kTlhOZ0lWY3NwbjQ/view?usp=sharing
https://drive.google.com/file/d/0B7xHQPjEw22kTlhOZ0lWY3NwbjQ/view?usp=sharing