Changing the default or preference to remove the banner sheets doesn't get enforced on the client's settings unless you have the client delete the printer object, and reconnect to the server's print share again.
Any ideas how to enforce this setting on Windows clients? FWIW, these are XP clients connecting to a Win 2003 print server.
Try to switch off banner sheet via Advanced settings on the server as follows:
Printer Properties - Advanced - Printing Defaults
as some drivers treat Printing Preferences as local setting.
Always adjust your printer settings using the printing defaults option in the driver, the changes you make there are getting pushed to the user.