If you are using hp-toolbox from Hewlett-Packard and the HP print
drivers, somewhere during the SL7x upgrade/maintenance chain (including
subsidiary application), the print driver appears to "break". I used
the hp-toolbox GUI and had to install new plugins from HP for this
application. After that, the HP printer (connected via USB to a SL 7x
Linux workstation) again printed.
Yasha Karant