Yep, crashing here also. Here is what I did.
Started new game. Only changed armor for rocket laucher fella in soldiers screen before entering crash site.
Spread my men around, spotted one alien. Alien killed my shotgunner with reaktion fire. Then i killed the alien with sniper.
ran some more, spotted another one. Then i tried to hit it with my rocket laucher guy. Chances to hit was 0%. Nothing was blocking my rocket. I fired the rocket but it exploded on his face. Then i went to inventory, placed rocket launcher and pistol to the ground and hit inventory exit = Crash.
Another crash happened same way. Tried to place rocket launcher on the ground = Crash.