Managed printers

Hello, A strange thing happening here. Our OD master (10.5.8) hands out printers to our managed home users. We configure the printers using WGM on a 10.5.8 workstation. It all worked fine until 10.6 (BETA image now on 10.6.4) came along. Now the printers nolonger get listed in the systempreferences printer / fax window...? Localhost:631 shows them as MCX records perfectly and all applications work fine after a command-P. Listing only the 'managed' printers as specified in WGM in the mcx.plist. But they odly enough don't show up under systempreferences??? Any thoughts?