In the past, when an autobrake selection was made, brakes activated automatically just as they should have activated during the landing roll. Somewhere along the line, I apparantly have done something that negates this function. Spoilers do deploy automatically when armed and reverse thrust works fine, so I assume that my throttle calibration is not the culprit. I have lost my autobrake activation for some reason. I do not know where this is addressed in the config or air files. As near as I can tell, FSUIPC has nothing to do with this function either. Manual brakes work fine. I do have USB CH foot pedals. Anybody have any ideas?