-In my game, I've run across a city I cannot attack: Avignon. When I move the attack cursor over the city I receive the red circle which indicates territory into which I cannot move. I've attached the save game.
Ok.. not to be nasty or anything, but trevort
almost has it right, and Nosferum you need to maybe look again over the first few pages of this thread....
If you look in the first few posts of this thread, you'll find a Feature described quite prominently by Afforess which describes a City Gate building (it's part of his description about Castle-related buildings and how important they are. The building concerned is the City Gate.... ZOC issues aside (I'm not so sure this is a ZOC thing), the City Gate completely prevents forces from Civ A taking a city owned by Civ B until the defensive bonus for that city is reduced to less than 25% (or is it 20%...? I forget).
But the info is right here in this thread, it's not hidden, and it's certainly not in fine print... heck I knew about it before I'd even downloaded the mod
My suggestion for investigating your potential bug is to load up your save (I'm at work, thus can't download your Save and see for myself
), check Avignon's current defensive bonus... if it's above 20/25% then enter WorldBuilder using Ctrl+W. Check the city using the city plot editor to see which buildings it has, and see whether or not it has the City Gate building. If it does, you know that it's not a bug, the mod is working the way it should.
Best of luck.