Am i missing something that is required to start a revolution? As far as i'm aware, it's 50% rebel sentiment in each city, and 50% overall on the bar on the revolution screen. I've only played four or five games. I could do it in the first one which was the first scenario. I wanted to try to win a huge game by conquest, so i unticked independence victory on a custom game. I've tried twice (the second time just getting to 50% as soon as possible to test), and neither time could i press the "start revolution" button. It stayed greyed out. Could this be a bug or am i missing something obvious?