Ha!

Does this look familiar to anyone?

It turns out that the root problem _is_ also present in the Windows
version -- but it's masked by a peculiarity of the run-time library's
handling of special floating-point values.

What happens is that _somewhere_ in the photon computations one of the
mathematical operations results in "not a sensible value", which carries
over into the computed colour values. How such values behave in the
conversion to the RGBE format depends on the run-time library
implementation: On Windows it results in zero values, thus "healing" the
problem. On Linux however, it results in rather high values instead.

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