hi,
there seems to be a bug in the push/popStyle-implementation.
see demo code below. the box should always be in a saturated red.
tested in processing 2.0.3.

void setup() {
size(640, 360, P3D);
}

void draw() {
lights();
background(255);

pushStyle();
popStyle();

translate(width/2,height/2,0);
fill(255,0,0);
box(100);
}

with push/popStyle

without push/popStyle