I think this is the right section,

I have a problem where in just one level the lighting doesn't work. In every other level I have I can use lights, but in this one level no matter how many or how few lights I place there is just no effect and the lighting stays at default levels. Like in this one:

In this one, like every other, the lights work to make shadows, and I could make them green or blue and whatnot. However in this one:

the lighting doesn't change no matter how many or how few lights I put in.

Does anyone have any advice as to what the cause may be? I'm using GS Pro 6.22, but I don't know if it's a version problem since the lighting in other levels works.