At the very beginning of the game after you first meet the Deathknight, you can try and enter his cell. When you do this it is supposed to trigger a scripted event where he protests to going into the cell. After the 1.4 patch, and in 1.41, this script no longer triggers. Also, 1.41 also has a tendancy to CTD when clicking on items like garbage and rotten food. Before 1.41 I resolved CTD's by turning down my hardware acceleration for sound. Now it happens even with hardware acc turned down.