We are a High School running VW/RW (60 licenced seats, latest update) on a Windows 2000 Professional Network. Machines are Pentium III, with 128 MB RAM. When attempting to perform Solid Subtractions which involve a Sweep/s, we frequently get the error message....'The solid you have tried to create cannot be computed. Edit the geometry........ and try again'. What does the message mean? How does one 'Edit The Geometry'? Why is it that the same operation does NOT always have the same response, (ie if you tried that operation at a different time it may work perfectly?) Changing the 3D resolution in the preferences does not have an effect. Regards P Gannon