The changed reform triggers shouldn't crash the game, unless you've inadvertently made the game spawn tons of reform buildings. Still, it could be an overflow of buildings somewhere, but it's hard to investigate...

I suggest teleporting over an army to Jerusalem and knocking away any armies in the vicinity to see if it makes any difference, and also force diplomacying the AI to give you all the cities of the faction(s) that seems to cause the crash so you can investigate for any excess buildings.