Version: 0.76 (this may have been fixed in 0.77, but I'm posting anyway)
EDIT: The city was called Deorcnysse, not sure if that is a random name or not. It was the wildlands with lots of darklings and spiders (not sure if that is completely random or not, either. Haven't played enough to be able to tell).
As a good race, I took over a wildlands city. It was fun having darklings for a bit, although the city sure didn't grow very fast.

Quite a number of turns later, the city was gone. Poof. No more. No event, no nothing. My troops in the city were gone. Sorry, I don't have a save game or a dump for when this happened because it didn't cause my game to crash, but maybe the images are enough to investigate and divine the bug away.
