Doubt this makes any difference but I do have 3 things turned off because I dont like what they do, you could turn these 3 off (if they are on) and see if it might be one of those settings:
Neutral Lighting
Lens Flare
Vignette Effect
If it does stop the crashig you could turn each feature back on 1 at a time, relaunch game and see if it starts crashing again. If 1 setting is somehow doing it then report it here so Ubisoft and Massive can focus on that setting.