I managed to crash the game by running out of memory with the wizard.
I had a lot of flaming earthen orbs, the frost nova and double experience abilities. I also had several of the trigger ability on level up perk.
This is the result.
283 days ago(+1)
I had the same out of memory bug with the wizard. I think the cooldown reduction formula needs to be changed - 99% cooldown reduction is a bit too ridiculous!