Mine often do not work and I'm not convinced it is the result of the optos. I can manually trip the optos, get the sound effects and DMD animation, but still not have the chase lights activate.
If the right loop switch is tripped without any other switches being hit (ie soft plunge for the super skill shot), every time I have tested it, they do not work. Tripping another switch usually reactivates them. It seems like there is something in the code.