If you have copied your Poser 8 runtime into Poser Pro 2012 you have effectively over written a vast amount of the new stuff with the old. Not least of which will be all the Python folders. Poser Pro 2012 uses a later version of Python to Poser 8. You now have a mixture of both.

At the first hint that something is not working right I suggest reinstalling Poser Pro 2012.

Then simply add your Poser 8 library using the add library button top right of the library panel.