Approx 5 minutes after start of playing the game somehow crashed. I was in the middle of a quest (Wold Stronghold) when the screen went black. Only the unit buttons, return to wordmap button and minimap was visible. rest was black. The minimap was showing the overview of my home town and not the map of the siege. Only way to stop was alt+F4.
This also happened when the duplicating bug happened. Until now the duplicating happend when on the world map or in the home town view. Never while questing. I didnt check no of units in hometown but I am quite sure this is the same bug I described in this thread.
The log file after alt+F4 is attached. I hope this helps to investigate.
I also want to report an observation which might be helpful or might be not: When starting the game or coming back from battle, the loading screen gets black for a second and going back to normal brightness. it happens mostly 2 times, sometimes only one time and once it happened 3 times. This behavior started the same time the duplicating started.
Good luck for the hunt.