The unlimited move option crashing the game is mostly from the game, not the trainer. It would help if the unlimited movement was limited down somewhat (as they had to do this with the total war trainers if I remember right).
Until its fixed by a patch/updated trainer. Just don't click out of the movement range box and it wont crash. Just wait for the unit to move to that location and click again.
I haven't had this problem. In fact I haven't crashed at all aside from installation issues with windows 7.
Have you tried re-downloading it?