It seems to work ok over here... Sometimes there are problems with objects that get healed when you save the file and load it again, this is possibly one of those.

Can you try loading this file and trying it again?

Hmmm, I am able to reproduce the problem when I create a fresh version of those solids by doing a revolve of the curves (thanks for including the curves with this sample!), and again it goes away if I save and load again.

I suspect it may have something to do with the planar areas of the revolve at the top and bottom - the revolver treats these as a special case and puts a plane in there instead of a revolved piece, possibly something is wrong with that plane, I will try to check it out.

Thanks for sending the example!

- Michael