For me too, the exit crash has stopped.
The CTD crash on the other hand:
This is the last thing I saw in the shadowlord event:
(spoiler tag to hide large image)
It seems that the CTD crash has to to with loading up a lot of graphics at once. My computer can handle single casts of armageddon, but three at once was way too much. Other peoples computers can't even handle that much. The other person from my guild did fine at first in that same event, but as time went by his graphical performance slowed to next-to-nothing and he too had to switch clients.