have you updated XQuartz lately? to get the rootless window back you its not going to be -s 0 usually... you need to look through the xrandr list, but its going to be a resolution with the right X, but the Y will be 22 less than your actual Y. Say your screen is 1920x1200, the rootless resolution you want to switch back to will be 1920x1178... any other resolution and you have a black shielding window.
