Quote - i was just reading something in the ds forums about single sided and right angles.  issue doesn't seem specific to firefly.

"Light leaks" are not something specific to Firefly.  It's a complex problem of inaccurate models, algorithms, and a bunch of different factors specific to "global illumination", or bouncing light, throughout a virtual scene.  The problem is that Poser and D|S are just now just adopting features that the rest of the 3D world has been using for many years.  Not all of the content that has previously been created to work with Poser's older features are prepared properly to handle these newer, more advanced features.  Many models for Poser and D|S contain no volume (non-manifold, single-sided goemetry), and have other issues that weren't considered a problem when we weren't able to bounce light around our scenes.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.