I've said this a hundred times about this game. With every patch they add in even more anti-cheat bull**** that crashes the game if it detects even the slightest thing is out of whack. I think at this point we might as well just retire the game and be done with it as all we continue to get are complaints.
these are the cardinal rules
1) if you turn an option ON, when you are done using it, turn it OFF
2) don’t leave options ON and then go poking around in other menus and icons/ units that don’t pertain to that option. turn it OFF
3) use numpad / to deactivate ALL options before entering battles, ending turns, etc.
4) after new turn has started OR if options don’t appear to be working any more, likely you need to press numpad / to reactivate the trainer
Here is a video demonstrating the options working fine with no crashes when following the above rules.
Link