We ran into a problem where the print properties or preferences of a shared printer being accessed on a Microsoft Windows client PC would cause the print driver to be re-vended (downloaded/installed) from the server and an Event ID: 20 entry to be logged in the Event Log. Event ID: 20 indicates that a print driver has been added or updated. Slow client UI response and/or slow server performance was also reported. In some instances, the driver would generate over 100 Event ID: 20 entries in the Event Log. Selection of the printer from an application may freeze up the application and printing to printer was reported to take up to 15-20 minutes.
This issue can occur if the privileges on the print server are set such that users with print access also have manage permissions on the print queue. [more]
Disable queue manage permissions for users. NOTE: In my situation, the user was a domain admin. Removing manage permission for domain admins would prevent further access to the printer. I had to add a separate group to allow management permission before removing administrator permissions.
To change permissions:
From the print server, right-click the printer queue (object) in the Print & Fax window.
Select the Security tab.
Click the User Group used for printing permissions.
Deselect the check in the box next to Manage Printers under the Allow column.
Upgrade to UPD version 5.1 or later.