Another  common problem with imported models is that their texture settings are often inappropriate.

If you're seeing bright spots or bright triangles, change the Material Room specular settings to black.

If they're dark spots or triangles, it's probably a reversed normal issue. That's not so easy to fix. Plugging the Alternate Diffuse node into the texture might help with the render, but my memory's a bit vague on the that solution.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon