Probably the biggest shake-up was AW for me. Laying out agenda, principles and GM moves, and the miss/partial/hit tech, was very eye opening.
Most recent shake-up: many more than one GM, most recently experienced in Kathryn Miller ‘s game Immortal Beloved, about a panel of gods sitting in judgment of a couple’s love. There was something new and intense about being one of a pair of PCs facing a wall of pesky, questioning GMs. Like the best/worst panel job interview…