Boolean bug?

 From:  Frenchy Pilou (PILOU)

Curiously the solid sphere A don't make the Boolean difference, the Sphere B yes!
(yellow color is just for s"show",
for the boolean operation I select first the base object (yet booleaned) above spheres :)

Ps a volume in MoI (like exo.3dm) is a "surfacic" object or a "volumic" object?
(surfacic against solid)

EDITED: 10 Sep 2006 by PILOU