Well, what you do with melee units, which are my preference: you Dominate the bad, bad man. You watch how fast he goes, and make sure he ends his turn next to, but can't hit your units. Then they all beat him into the ground.
My city titles are often displayed incorrectly, they switch to another city title. Fixes itself if the title is updated (for instance if I garrison a unit) or reload the save. I had a unit portrait swap itself with another unit portrait. Eg, my "honor guards" mini icon was showing the "Leather Riders" mini icon. Tactical Combat: Units that die still get their retaliation hit, even though the dying unit is doing its death animat
potential workaround: try establishing a caravan to visit the city
If, in the campaign, you build caravans and send them to the NPC cities, the caravan arrival counts as you visiting the city in the "second round" of warnings.
Sometimes two wandering heroes bump into one another, and then they form an army and can't be recruited even when the little "..." icon pops up. Also: there may be some strangeness with changing the name of the world and/or messing around a lot with character creation (eg, making a king, going back, making another one, going back etc) and spawning of goodie huts - in my first game it spawned bug-level craploads of goodie huts (like, a dozen morrigan towers, or so many notables that