Quote - C6 imports the poser bump maps into the shader, but often sets their value to 0%.
To get it to apply the bump, open the shader and click on the top level shader so that all the other shaders are listed as a summary on the right. The bump subshader should show that there is a map and have a slider for % applied (which now probably reads 0). Adjust the slider to the level of bump you like.

You have no idea how thankful I am that you pointed this out. I couldn't for the life of me figure out why my bump maps were having no noticeable effect. (I did find out they don't usually make for good displacement maps)

Another thing I've found about Poser map placement in Carrara shdaers is that if there is an Alpha map from Poser, it will load into the alpha sub-shader channel in Carrara. I've found on V4 at least, you don't want it there.
You need to either move it to the transparency sub-shader channel, or do away with it altogether. (depending on what it needs to do for that domain)
It took me forever to figure out why I couldn't get any nice lighting effects or reflections on her eye surfaces and corneas.