Here's a render using just photons, no radiosity or media. The rest of the
values are the same as in my previous image post--except that I changed the
reflection of your "water box" to reflection{1.6} to brighten up the sandstone
walls, to see the detail there.

Some strange things are going on!

Those multiple, ragged dark patches *could* be the main reason for the problem
you're having, although I'm not absolutely sure of that. Looks like the photons
aren't hitting certain areas(?). I would try and concentrate on getting the
photon coverage worked out, before pointing the finger at media
or radiosity.

I tried monkeying around with photon spacing, but that didn't help. You might
want to try a different photon scheme, using count rather than spacing.

I'll continue working on this photon problem--it's a nice challenge! I'd like to
see this overall problem *solved*, as I have a similar scene of my own in
the planning stages.

Ken W.

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