Printing fails under 9.3

Dear list, I am trying to print under 9.3 over the network. The printer seems to be configured correctly as I can print test pages from the YAST printer configuration interface. But I cannot print as a user or as root later. lpr and lp do not work. Strangely enough, I can send test pages from the from the gnome cups manager as a user??? How can I check where the printjobs do go to or disappear? Any ideas how to solve this problem in general?? Thanks for your help. Ulrich