Sorry dude. I kept looking for the word trough in your original post but must have been blinded by the LEDs.
It will always pop a ball into the shooter lane if there is none sensed in the mist locks. But then it should try to load it. Somebody that's more awake right now may be of more help.
Make sure you don't have one too many balls in the machine. I did that once and it got wonky too.
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