Sorry If this has been answered already, but I don't feel like reading 90 pages to check right now. The day after World War Breaks out (Over Luxemburg in 1939) the game has a CTD with no error messages. I'm playing as Qing allied with Greece right now.
I have the same problem actually. I first thought it would be because the old savegame wasn't compatible with the map fix (I was one year into the great war already), so I started a new game with the Qing. Everything went well for the first 4 years, I unified China, aligned myself with the central powers and then the war started. Suddenly, 5 days after it started my screen went black and it returned to Windows. I reloaded the game several times, but it always crashes at the same point.