I use quarters in all of my pins and arcades, I recently acquired a Black Hole that has 3 coin slots, (Left) Quarter, (Middle) SBA, (Right) Quarter. The quarter slot on the left works 100% of the time, I don't have any SBA's, but the slot on the right does not work AND it makes the machine have a brain fart. If you load a quarter, the credit/ball in play display on the left side of the apron goes blank. You can't start a game and it won't count credits in other slots after that. What gives?