I just remembered something else weird that happened in that Genoa game I mentioned in the 1.5 thread. As I was conquering the Novgorodians, one of the cities I took was
Viborg. The very next turn, there was a Genoan revolt in Danish
Viborg. I had no culture in that city, or even anywhere in Denmark- my closest city was Kivik, which I hadn't given back to Sweden yet.
I couldn't think of any reason why a city in the middle of Denmark would have a pre-culture-flip revolt, other than the possibility that the computer got confused with the two Viborgs. I don't have a savegame to give you, sorry- but has anyone else ever come across this?