I was wondering if this was a possibility. When a wonder is started, the system checks your prereqs (aka proper number of policies, or proper number of followers in the case of your super religious wonder), and then once you start building, that wonder is locked in, and can't be dropped because of a loss of prerequs. Its quite annoying when you build a religious building, and then you lose it because you slipped just a bit on religion in a city, and then have to restart it. In my latest example, I was a few turns from the Bradenburg Gate, and then because of my CS allies was lost, I lost the prereq and the ability to make the wonder. I think once you make the prereqs, that should be it, its not something you have to key checking round after round. Thoughts on that?