hmmm im suspecting the board then if your saying youhave programed in win 10 before off
See The above shows player 3 sw 8 assigned to L Cant get any simpler than this it says board reconfigured successfully at the bottom as you think it would if it was going to work. Then I do the test no mame or emulator even involved at this point and nothing else connected except 3sw 8 to the microswitch and ground
No shift key or IPAC shift nothing. So this would not seem normal operation. It sounds like yoou dont have these issues.