I have noticed in a few of my science run games that when i start a war most my cavalry units loss their movement points but the game registers them as still to move and i get stuck on this. Neither skip not station works and as result i can no longer do anything with them and basically my game gets stuck. I have tried reloading save points before but it keeps happening after i start a war sometimes with 1 unit some times with multiple, either way it stops the game from progressing all together. 
Literally happens them being good on movement points 6/6 and when i declare war one or more will be at 0/6 but still the game insists i need to do something with this army, i have tried moving them to an other location but nothing seems to help.