In my game as France, using the latest beta patch, I ran into a recurring problem.
I Attacked the city of Berlin. When the turn resolved, I captured it. But, after everything had been resolved, I got the message that "WON has stopped working" and the game then crashed.
I tried several times to replay the turn. Same result, Berlin captured, game crashed.
Finally, I went back to the game using the "Resume" tab, after the crash. The game loaded perfectly, with all the resolutions of combat, etc, perfectly saved, including the capture of Berlin, and I was able to continue.
This might help with other crashes, as it resolved this one.