I have a simple random walk program.
It has 2 random walkers starting from the center.
It has been simplified here to isolate the bug.
(Processing - 0118 Beta, Windows XP)

It is kind of working, but when I run it,
most of the time
-- the window size is wrong,
-- the drawing size is different,
-- the background color is wrong,
-- the starting points are wrong.

Is this a bug, or is my code wrong ?

Here is the code:
---------------------------------------
Walker w1,w2;

void setup() {
 size(1590,1100);
 colorMode(RGB,255);
 background(215,200,210);
 frameRate(200);

 // Create walkers
 w1 = new Walker(width/2,height/2);
 w2 = new Walker(width/2,height/2);
}

void draw() {
 // Run walkers
 w1.walk();
 w1.render(75,150,225,75);
 w2.walk();
 w2.render(75,225,150,75);
}
---------------------------------------
class Walker {
 int x,y;

 Walker(int x0, int y0) {
   x = x0;
   y = y0;
 }

 void render(int st1, int st2, int st3, int alp) {
   stroke(st1,st2,st3,alp);
   point(x,y);
 }

 // Randomly move (x,y)
 void walk() {
   int vx = int(random(3))-1;
   int vy = int(random(3))-1;
   x += vx;
   y += vy;

 }
}
---------------------------------------

It's the same, if I remove the frameRate() command.