I noticed a CTD bug while playing the demo:
Start sieging an enemy province. When it is finished, the UI for the siege will start to recede to the left-hand side of the screen. During the receding, press the "assault" button. This will crash the game.
Start sieging an enemy province. When it is finished, the UI for the siege will start to recede to the left-hand side of the screen. During the receding, press the "assault" button. This will crash the game.