Lets fix some things so that you get a decent render in Firefly.  The Illustration below outlines the troubleshooting you should address.

Starting with the PoserSurface:

Change the Diffuse_Color from blue to white and change the Diffuse_Value to 0.  You will use the Alternate_Diffuse channel for the meantime.  Set your Specular_Value also to 0, you will connect your Specular map to the Alternate_Specular.

The Ambient_Color channel is a cheat to simulate SSS; right now you don't need it.  Turn that color chip to black and set the Ambient_Value to 0.

Reflection_Lite_Mult should be unchecked.

Get rid of everything that is not connected to the PoserSurface node and render your scene.

If you followed my instructions, you have simplified your Material Room skin shader to give you a better render.