In my experience,5 out of 10 heroic victory's are ending in a ctd.Dont had any probs when fighting reinforced battle's(playing 1.2 btw).But its really a breaker getting a ctd when you just managed to win multiple battles in one turn with the same lousy army against the uber army's of AS(i forgot to raid his lands...so i deserved it).But getting a ctd after the last battle in that turn(about 2 freaking hours)....you really have to see my second! mouse...

So i trying things...like waiting to click or save for every battle(lot of ctd's fighting on mountains side-hv-).I also tryed to go back to the main menu of eb after a couple of years....almost no ctd' attack.

Try it.just save.eb main menu.load save game.activate the script again...(mayby this issue has something to do with the script...i dont know,but loading a new savegame also requires to activate the script again)