Every time I talk to Cowlen on the docks of Silvermyst Isle in the Draenei starting zone, he explodes and the game crashes. ( http://imgur.com/a/zvi1N )
This has happened once before with a different NPC, as seen here; https://www.youtube.com/watch?v=2EUv...ature=youtu.be (Ignore my friend's ramblings in the background of that video) it wasn't that much of an issue at the time, due to the NPC not being a major quest giver.
But with Cowlen, it makes his quests a pain to complete, as I can't read the quest dialogue for more than a second at a time before I have to re-log.