The Chem3D Plugin does not seem to be working well anymore. Sometimes I can't do rotations or display surfaces.
Problems might occur with the Chem3D Plugin if you do not have enough memory allocated to certain versions of Netscape. Try allocating 15 MB of memory to Netscape. You can do this by clicking once on the Netscape program icon, choosing Get Info from the File menu, and typing the new amount in the Preferred memory text box. Please note that Netscape can not be running when you try to allocate more memory to it.