Here's a simple test rendering:
  http://neil.fraser.name/test.jpg

It is a solid glass sphere, nested inside a hollow glass hemisphere.  The
yellow bar in the background is just for reference.  Individually the
sphere and the hemisphere are perfect.  But for some reason when combined
they suddenly go opaque.  I've switched on photon refraction, but that
doesn't seem to make a big difference.  What am I missing?

Source is here:
  http://neil.fraser.name/test.pov

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