"The light seems to bounce around pretty much as I'd expect, though there is something a bit odd going on where the walls meet in the corner." I believe that's caused by sampling artifacts, a rather well known issue with radiosity at low sampling. I raised this issue before in here, and it seems Vue 5 lacks certain user control over the radiosity solution that would help clean that up without stressing the calculations unnecessarily. Vue 5 Pro might have more detailed control over the radiosity solution, and allow this to be cleaned up easier.

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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.