FYI, I'm running Processing 1.51 on W7 64bit.

The following code works perfectly.

1. void setup() {
   size(1100,800);
   background(255);
   // smooth();
   noLoop();
   }
   void draw() {
   for (int x = 0; x < width; x+=4) {
      for (int y = height; y > 0; y-=6) {
       line(0,0, x,y);
      }
    }
   }
   
   

Uncomment the smooth() statement and the program stops working -- no error message, no drawing.  Running the program in static mode (no setup() or draw()) results in no canvas window either.

I don't know if this is peculiar to my system or my environment at the moment (I have had sketches go from failing to working just by rebooting)  I do note that the Processing doc does indicate some problems with the smooth statement so perhaps this is a manifestation of another problem.

Best Regards, Jim