Debug.err file here.
Enemy conquers city. Next turn I attack my old city with my sovereign. Crash to desktop. No minidump generated but I uploaded the debug.err file.
Edit: Looks like it's repeatable. I loaded an autosave and tried it again, another crash to desktop but this time a mini dump was being generated. Here.
Edit2: Okie, I've got a save. Easy to reproduce. Load the save. You'll get declared war by. Use the sovereign to attack the nearby city. Battle report and then a crash to desktop.
