When I turn on Atmosphere Volume in a *new* scene (or any of my recent ones):

my scene renders as completely black.

If I render a scene from several months ago, atmosphere works correctly, adding a foggy blur as expected.

It would seem that it's some sort of global setting, given that old scenes work fine but recent ones and new ones do not, so I compared the settings from Atmosphere and Render Settings and cannot find anything different.

It seems that it might be that the sensivity to Volumne_Density is very, very high. A setting of something like 0.0000001 seems to sort of work, except that it's too sensitive to fine tune.

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Superfly, Poser 13.2.581