I've applied IBLs to my test scenes and they will render in Firefly, but in Superfly I just get a silhouette. Do they not work with the Superfly rendering engire--what about OBLs? I have sets of those from previous versions of Poser.

IBLs do kind of work in Superfly, but not the same way as they to in Firefly.

IBL is a trick to get ambient light into a scene without calculating indirect light, Superfly/Cycles always calculates indirect light, it does not know this trick.So an IBL will just be a different kind of Envsphere, just with different mapping. You cannot see this light, though, when you still have the construct ("Ground") visible, since it shadows the whole scene.

That's the main difference between an IBL in Firefly and in Superfly - Superfly always calculates shadows, but an IBL was built to provide ambient light and not be shadowed.

If you want the look an IBL gives, you need to render with Firefly.

I forgot to mention that while an IBL does light the scene in Superfly, it does not provide a visible background. Since any background would again create shadows and block the IBL, it's useless with Superfly.

Tbh I find IBL in Superfly much better than firefly - you have to deal with it differently: put the emission value up higher (if you're not using HDR maps you might need a value of +24, for example), but the lighting system seems to work much more realistically [especially with a few area lights in the mix] so it's worth the effort.

If you have objects in the way then yeah you'll have shadowing, but as long as you have enough bounces in the raytrace, the light will get round and the overall scene will be infinitely more realistic, because that's what happens with real light in the real world: put objects in the way and it affects the light....! IBL in firefly was always a bit of a fudge.