I played until chapter 3 of the campaign then needed a break from my dwarven princess ,
so I started a custom campaign with lizard then elf on the same map each time with crash at every rts battle with dragon, battles with commander or auto are ok, it is the map planet earth and also the mountain dragon each of the two tries,

I have tried several locations of battle for using my dragon, and the thing that makes me tell there is a problem with planet earth is that with the eye icon visualisation of battle map prior to battle , I get everywhere a blank screen in the square where there should be a simplified map, and when hitting ready the game tries to load then crashes to desktop