The Network that I manage uses Netware 5.0 and Zen 3.0. The work stations use Win95/98/2000 and have Client 3.31 or higher. Sometimes I have users who after they log on and try to print have no printers listed, even a local printer. Usually I tellthem to reboot and the printer objects return. Sometimes they have to reboot several times. I have 1,600 workstations on my network and about once a week I have about five calls with this issue. This has been happening for several years. What could be some of the causes?