Ok, more info:

Ambient Color is 100% black, Ambient Value is 0. I only changed Diffuse to white, everything else is default.
All parts are "visible in raytracing" and "cast shadows" set.

Now I have 3 point lights with raytraced shadows,
Blur Radius 2, Samples 19, Min Bias 0,05, AO off, Athmosperic Strength 0,01

Poser Version: Poser Pro 2010

Render settings Firefly:
Cast Shadows On, Raytracing On, Raytrace Bounces 2, Irrad.caching 50, Indirect lighting Off, pixel samples 5 ( tried up to 12), Min Shading rate 0,1 (tried 0,01 too), all the rest is Poser default.

Thanks so far...