I've found an interesting issue playing quick combat as a German pilot in late 1918 recently. It is mid-October 1918 and my pilot is in Jasta 1, so they have been moved out of Flanders to the Lens/Mons area of the map. Whenever I tried playing quick combat with this pilot in Flanders, I had no issues, but when I attempt to do the same in Lens/Mons, WOFF crashes on me.
I've found this issue only occurs when the pilot is stationed in the Lens/Mons area of the map. As a test, I created a new American pilot in the Verdun area, and tried to start a new quick combat mission. Lo and behold, the game did not crash for the American pilot, and I was able to mess around in quick combat.