Turning off "auto select next unit" is broken.
To express the bug:
1. In options menu, turn off "auto select next unit."
2. Play a game until you have two units roaming the map.
3. Exhaust one of them and end the turn while he is still selected. Your camera and selection is dragged over to the other guy.
Every two seconds I trip over this. I spend as many moves walking backwards as I do walking forwards. 
