Any ideas why B6 is doing this with a directionless light source??

Lol, told ya. Nope, I have no idea.

I would also suggest trying a "dummy" HDR file that is really an LDR... maybe it just needs the "hdr" extension but without the actual HDR data...(I think this would be possible in Photoshop).

Yeah, I tried a turning an all white .bmp into an .hdr with hdrshop, and also made an all white .hdr with 7 exposure levels with Photoshop. They both react the same in Bryce 6, they both cast a shadow.  :o(

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