Attached you will find two files, one from 590AD and one from 600AD. In 590AD, each of my AI opponents will pay per turn for items, like my territory map or world map, for instance. However, in 600AD, only the Netherlands will. I have searched hard to find any differences, but I already checked with Civ Assist and no trades have been broken, they are identical, in fact there is no difference between 590 and 600 trade wise. I have not declared war on anyone. I have been engaging in a strategy of leaving my units on unroaded resources and luxuries, would that set off the AI? If you fast forward 5 or 10 rounds, you'll still see my AI opponents refusing to pay per turn for my items, although they are still willing to exchange their luxuries for my items and pay by cash. Nothing changes over 5 rounds in that respect. So what is the problem here, why aren't they paying per round anymore?