Why doesn't an option to select "materials library" show up when I right click on my tool palette title bar. I got an option for "materials" but not for "materials library". I noticed it missing when I was viewing "Lynn Allens" latest 2007 webcast for visualization. Did I miss installing the library when I installed AutoCAD 2007. There are a lot of materials available but I don't see the possible 300 to 400 which are supposed to be available. Do I need to reinstall AutoCAD 2007?