vexiphne, you're on Poser 7, not Poser Pro... correct?

It's not a Mac problem, I can tell you that. My renders with the PR3 shader are fine.

It's most likely just your lights, as B3D said. When you post the render, it would help if you also posted what light setup you are using... type and intensity.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)