God and Kings (and coups)
After trying it out, and posting about how much I liked it, I moved from vanilla to Gods and Kings. Yeah, that was a mistake. Since it was my first time for this version, I played Prince, standard size pangea, 8 civs
I don't know if I just got some difficult leaders, but it seemed like every other turn Theodora or Alexander or one of the others was staging a coup in a city state I just bribed or finished a task for. By around the halfway point, I gave up giving them any money or doing favors.
About a third of the coup attempts failed, but they did it so often that hardly mattered. Back to neutral we go. Again.
The other thing was something I've seen in BNW too. Inexplicable fluctuations in GPT. I don't mean the difference between golden age earnings and normal age. I mean one normal turn I'm making 12 gpt, then I'm suddenly down to negative 3 without any new units or adding more than one or two new buildings.
In BNW I always assumed it was trade routes from other civs, but that doesn't happen with Gods and Kings.
I kept looking at what tiles the cities were working, but no explanation there either.
Then there was the mystery of the impotently violent Elizabeth. As my close neighbor, she declared war on me three times over 70 or so turns. Okay, sure. Why not. But the first two times she sent one single unit at me before asking for peace, and the third time three. I had a dozen upgraded units near our border the whole time. And every time I gave her the peace treaty, her attitude toward me was Friendly.
By the third time, I took two of her cities to let her know she needed to stop declaring war on me. Then her attitude degraded to neutral.
TL/DR Non-stop coup attempts and far too many succeeded. Weird gpt fluctuations. AI behavior even worse than I'm used to.