I have the same problem as you have. At the point while setting up scenes, the poser UI just freezes. It usually will come back after a few minutes, but once it starts it keeps doing it again and again. Up to that point is a bit slow but you can work with it, after that it is impossible. It usually happpens if you have more that one G2 figure in the scene.

The problem does seem to be related to the number of morphs which have been installed for the figure.