We may never have a build that is absolutely positively ctd-proof. The reinforcement army ctd has been greatly diminished, but appears to still be present in some rare situations. BozosLiveHere has mentioned that the amount of effort and possibility of finding the reason for the ctd (which probably lies in unknown limits that the game itself has that we are unaware of - in which case it is exceedingly difficult to figure out what can fix it) may be so difficult that we are not able to ever totally eliminate it.

We are currently trying to fix a problem with a random crash before a battle - it seems to be sprite related (crashes before battles that then aren't there when you reload have been tied to that in the past), but the sprites appear to be there and working.