If we knew exactly what causes revolt CTDs, we would be closer to figuring out a definite fix (we've reduced the frequency significantly already). I believe we've seen plenty of instances of crashes both for player-owned and AI-owned cities. Perhaps razing all the buildings makes a difference, I don't know. We've seen cases where destroying the game field has made the revolt work, without understanding why (and not reproducing in other games, only for those few savegames).