When running sketches I'm always seeing a grey backgound for an instant, before the setup color is applied, even with minimal code:

void setup()
{
  background(0);
  size(800,600);
}

I've modified color settings in ~/.processing/preferences.txt (in Linux), and even ~/processing-1.2.1/libs/preferences.txt as follows, but nothing changes, the grey background flashes every time.

run.window.bgcolor=#000000;
run.present.bgcolor=#000000;
run.present.stop.color=#000000;

Any idea on how to display a chosen color at startup?