Effects disappear when object is on top of another
I am trying to make a shadow effect on a floor plan (I do NOT want a directional shadow). When I add an outer glow, it looks good on a white background, but when I move it on top of anything else (color/object, jpg, etc.) it disappears.
Is this a bug?
(Note that the other shadows in the plan are png files, not created in Illustrator)

