Everything except enhance runes. Unless reforging lets you use unstable enhance runes, then that's news to me. The reforging system itself is a great idea and I don't think there's anything wrong with it. My only problem is the new enhance rates from RISE which makes enhancing past +12 for weapons extremely frustrating.
The only times I crash are usually caused by some memory error after being AFK for 10+ hours perhaps and trying to run something. Because of that I just restart my game or PC before doing raids and whatnot.