"IMPORTANT: You must delete your Automobilista 2\savegame\[User Profile Number]\automobilista 2\tuningsetups to reset your car setups to their original settings - failure to do so may result in a broken driving experience (it is not necessary to delete your other game settings).
IMPORTANT: The extent of the physics changes means that a reset of Time Trial leaderboards will finally taking place in the coming days, so don´t bother much with previous lap times & setups."