The above save can easily be used to reproduce the bug. Steps:
1. load up the game, wait for the scene to load, right click the character "Jin" on the squad bar to focus your camera on him
2. the scene will load again and you'll end up over a building filled with a bunch of people. the building will be solid, cant see inside it, suggesting that the people aren't actually "in" the building
3. Select them all, order them outside of the building. They will move incredibly slowly through the building, eventually manage to unlock the door, get out onto the outer ring and then are completely unable to move further than that or down the ramp or anything.
4. your characters are now stuck
Workaround: save the game with the camera over your stuck people, reload the game, they will be unstuck.