I'm having similar problems with the new version from experimental 0.30-1. Adding a new SMB printer works, and the configurations file gets written. But if I try to edit the settings from gnome-cups-manager, the Username field is empty. If I enter a username I get these error messages for every character I type:
** (gnome-cups-manager:8659): CRITICAL **: gnome_cups_printer_get_attributes_initialized: assertion `GNOME_CUPS_IS_PRINTER (printer)' failed ** (gnome-cups-manager:8659): CRITICAL **: gnome_cups_request_new_for_printer: assertion `gnome_cups_printer_get_attributes_initialized (printer)' failed ** (gnome-cups-manager:8659): WARNING **: Neither request nor output_fd set ** (gnome-cups-manager:8659): WARNING **: failed request with status 1280 -- Cheers, Sven Arvidsson http://www.whiz.se PGP Key ID 760BDD22
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