You may have a problem with the driver. The driver is not sending the secure print command or you have a very hold firmware version.
Go to www.xerox.com/global and download the Global Print Driver and test. Also check if the firmware is older then 061.121.222.06507. If yes, go to Xerox web site on the drivers page and download this version.
I installed firmware version 061.121.222.06507 already and going to try drriver on Monday. Was hoping there might be some other ideas also. Thanks for the input.