The Mackay (office something), Harbor and Altdorf maps are the ones that cause problems for me (I've finished the game, so I think I've played all maps). Mackay crash when I end my first turn, Altdorf starts whithout soldier 8 and harbor has a ship where my soldiers can't walk, but the aliens can (I think it is the one farthest from the starting location), and one soldier starts alone in the middle of the map.
The promotions seem totally random to me. There should be some clear motivation for promoting. Also, it would be nice to be able to choose wich stats are improved.