fullScreen(SPAN) only showing up on display 1

This code:

```
void setup() {
  fullScreen(SPAN);
}

void draw() {
  background(0, 100, 150);
  fill(255);
  ellipse(width/2, height/2, 200, 200);
}
```

I'm only seeing the results on display 1.  Using macbook pro OS X 10.10.3 with some casio projector via HDMI.   Same true for `P2D` and `P3D`.
