Ooooookay, just had my first major mission bug out on me. Big UFO landing. Started off fine, made my way up to the door, bunch of Mutons arrived, was dealing with them no problem. Then a second wave came, and Overwatch triggered on the two heavies I had positioned by the door. This then triggered Intimidate on the Mutons, so the camera pulled over to them to show their little animation and then the game just... stopped. It zoomed out as far as possible, the HUD went away, and the music stopped. Weird.
So I force quit the game, load up the last autosave, make it back to the front of the UFO. Everything is going smoothly, until I wipe out the last initial Muton. Instead of having to push forward to wake up the next group, they all run out of the fog of war at the end of my turn, clipping through the door. The cutscene that's supposed to show just shows some random camera angles and I'm thinking ugh, this isn't good. I deal with the Mutons as always and everything is great until...
One just appears. It just literally appears out of thin air. In the middle of my squad. It wasn't even the Alien Activity turn, this just happened in the middle of my turn. A Muton just pops out of thin air, and then gets like three combat steps. He moves, shoots and kills one guy, then moves, and shoots and kills another.
Hopefully the whole save isn't entirely fucked, this is really annoying.