Thanks for the feedback. However, when I make the spheres inside of one another as suggested, then slice the sphere in half, there is still no inner sphere. Also, if I select the outer sphere and 'Hide' that one, again, no inner sphere.
I followed the animated demo carefully, creating the flat circle, then a large circle perpendicular to that with another smaller circle inside that. Then I use the Follow Me to using the flat circle as the path. The inner sphere forms first, then the outer, and I think I'm done, but every test I run after that indicates only a single (outer) sphere.
What am I doing wrong?
Thanks in advance.