I am not sure if this is a graphics bug or not, but I was in a party of 7 people and when we just entered the final level of the dungeon of the eye, off the Path to the Ire Mountains, over half of the players crashed out of the game.
I would have thought it bad luck, but as we arrived at the exit to leave the final level, about half of us crashed again.
The rest of the levels were okay, so we thought it a little strange that so many crashed on the entrance/exit of the last level.