Following up, the problem only appears when the scene is rendered in its
totality (with +b2 on as mentioned). When one of the main objects (object
{Glass}, object {Liquid} or object {LemonSlice ...) is commented out, the
remainder renders fine. Also commenting out either the "collect off" or the
"pass_through" statements in the object photon blocks at the end of the main
file gives a proper result. Getting everything back in again results in
darkness again.

Jeroen.

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