FYI: Did some tests and apparently the scene I was trying to render in SF took up to much GPU memory. Even though the scene is only 200 MB I would keep getting a "Out of device or host mapped memory". Error would flash by so fast I didn't see it. Sadly no errors in poser log files or system error logs to indicate there was a problem. So after a little research this appears to be a GPU error. So I guess 6 GB of video memory isn't large enough for a GPU render of my scene.