I have a scene with some objects standing on top of a box, inside a hollow transparent
box filled with media. There is a point light source above, which does not interact
with the media. 
If I add a new cylinder object the visible box will no longer be lit up even though
the objects on top of the box are lit just like before. Adding a new box object will
not give this effect, although adding multiple box objects 
will. (The new objects are much smaller than the box so they couldn't possibly block
out all the light, especially as the objects next to them are lit.)
I'm using POV-Ray 3.1 for Linux.

I'd be very thankful for any help on how to avoid this problem.

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