Is the bulb next to the solenoid expander an LED? I think I read somewhere that LEDs should not be used there.
I too had problems with the ball not ejecting on my Medusa. Reseating the J2 connector on my Alltek mpu corrected that problem. Wish I had more to offer but I've only been into this for about a year. (Speakeasy, Lost World and Medusa)
Good luck!