Gradients inside ovals or circles don't print to the Personal LaserWriter LS when the focal point of the gradient is perfectly horizontal or vertical. Instead, the ovals will print with no fill. The issue happens using versions 1.0 and 1.1 of the Personal LW LS driver (aka 7.0 &b 7.1) and occurs due to a known issue in the printer driver. The current workaround is to edit the gradient so that the direction of the ending color is neither perfectly horizontal or vertical. Then reapply that gradient to the object.