I am doing the Lip/Groove section of the Solidworks 2010 Part II - Advanced Techniques textbook.

However, when I try to insert the Lip/Groove feature into their provided part, the parts dissappear from my work screen.

The parts are still open and they are in the right spots in the hard-drives and my graphic drivers are reasonably up to date.

But the parts are not there on my screen, just their shadows, which is fustrating since I cannot select the faces to insert the features on.

Can you guys help me?