First combat mission. Not sure if it's related to the bug in the auto-dropping of items to the floor mentioned earlier, but I doubt it since I don't believe I killed the alien to cause items to drop.
I threw a frag grenade onto an alien and it exploded (the location was a mix of fences and a staircase leading into a house. Not sure if the blast just had too many interactions with the environment as it caused a CTD after popping damage numbers on the alien.
output.log