Cart Paths

Between the flippers are 6 lights, which indicate the next Cart Path award. Cart Path awards are given when you shoot an orbit after lighting it from the right inlane (for the left orbit) or the left left inlane (for the right orbit). The awards are:

Bonus 2x
Increase Cart Path
Bonus 3x
Increase Cart path
Bonus 4x
Bonus 5x + Light extra ball

The flashing award indicates what you'll get next. The awards reset at the start of every ball. It doesn't look like you get anything extra after you get 5x + light extra ball. You only get one Cart Path award per inlane trigger. You can only get the extra ball from Cart Paths once.

Orbits score 50K+50K for each consecutive shot. I believe getting "Increase Cart Path" bumps up the base value by 50K (i.e. 100K+50K/shot and 150K+50K/ shot). That resets each ball as well.

Each orbit has a big white circle light that flashes when it's lit for the next Cart Path award or for consecutive loop awards.

It worked on the NGG I owned a long time ago and I've never seen it not work on any NGG I've played.

I know you said those switches are working, but is it possible that another switch is activating and keeping the bonus X award from happening?

OR

Try a factory software install?

I had this problem with my NGG as well, I even replaced the roll overs on the in lanes and the orbits. What I discovered later is that even though the roll overs were working the stock orbit roll overs are just not tall enough with how fast the ball moves. I eventually replaced one with a much taller round style roll over on a whim and it made a huge difference in how well NGG played. You said you tried lighting the target with the inlanes roll over and then hitting the spinner which does causes the light to flash but it has to be the rollover on the opposite side of the orbit to get the cart path award, hitting the spinner alone does not give the award.