sorry for the 4 year old necro-bumpage here
but from reading thru the RPG postings this problem is related to the green label game code - i am having this same issue also with a Blackout and it is definitely not the switch #03 start leaf switch since i have verified it will do this when the switch 2J2 & 2J3 harnesses are un-plugged and a jumper is used to activate the switch matrix # 03 thru the pins on the board, it still will start a two player game with a single touch and if you do touch the pin two times it will sometimes start a 4 player game
i can see how if the machine was not in free play this may not even be noticeable but when credits are abundant it is a problem because you can only start a 1 player game about 50% of the time - the other 50% are 2 player starts
has anyone found a cure or reason why some machines do this and not others?