I've had a recurrence of a difficult to isolate bug. You see, it somehow doesn't persist with saved-games, so i'm afraid i can't upload you my save... i'm guessing this is why the bug hasn't been fixed yet .
I have noticed occasionally the 'label' for once city will get replaced for that of another. So for example Pariden has a city called X, Altar has a city called Y. Sometimes i notice that there will be two cities with the 'display' for X (the little name and quick-stats thing that appears above the city on the map). Hopefully you can isolate this wee beastie. 'tis certainly interesting that the saves don't seem to reproduce it.