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When I load the attached save, playing Pergamon in the Grand Campaign, the game crashes to desktop during the next end turn, during the turn of Athens. A new rival party recently emerged and there is a risk of civil war. On the campaign map, when I turn on the party ownership filter, the new rival party has no regions. Could that be causing the CTD - a secession by a party which has no regions?
I'm using Windows 10 and the Ancestral beta update (I initially had some issues when Windows 10 was installed but resolved them by verifying file integrity, deleting the C:/Users/AppData/Roaming/The Creative Assembly/Rome2 folder and starting the game. After that, game ran smoothly without problems).
I verified the integrity of the local files after this crash happened, no issues were detected. I have never added any mod to this installation of Rome II.
The crash report, save file and preferences file are attached.