Quoted from mo_twister:Add another to the growing list... I just unboxed my new ST Pro this weekend and I've only seen the multiball work correctly a couple times. Most times the second ball just sticks there with the first until it times out and lets them go. This is pretty sad that Stern would let an issue that seems so serious get past their quality control. I'm definitely not spending my own time and money to tear this thing apart and try to fix it myself. Stern better have some sort of reimbursement program for this issue to be fixed on a brand new game that I just spent good money on. On a side note, another issue I've noticed on my game is with the lockdown bar. It has those new clip things that lock it down, and when those clips are actually locked, the fire button does not work. When I undo the clips, the fire button does work. This isn't as serious to me as the multiball issue, but still not acceptable on a brand new game.
Your lockdown bar issue sounds like the leaf switch is gapped too close and it closes when the bar is locked. Just spread it apart slightly if so. A switch test would confirm.