I'm trying to track down the final demon in my BK2K restoration. Everything else now works perfectly, but seemingly randomly the game will forget it's in multiball after a single ball is drained. With two left in play. This happens for normal multiball AND Kings ransom. It happens about 50% of the time and I cannot determine any common circumstances that cause it. Everytime I think it might have something to do with something specific I'm proven wrong in the next test. Also, very rarely, about 2-3% of the time, the game will kick out a ball into the shooter lane when a glitched multiball's second ball is drained.
I've checked all the switches in switch test. All of them work, and none cause any weird switch behavior. No double registers, no unusual bouncing. Game works 100% other than this.
I found an old thread that mentioned one of his switches was wired wrong causing this behavior, but my game doesn't have the same wiring issues he had.
The game is running LA-2 roms until I figure out why it won't boot with my LA-4 Roms. But I can't find a change log to see if there is anything relevant.