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I would suggest that you review the following solutions to see if they can help determine and potentially resolve your issue and please post the results.
Solution : Supported Operating Systems and Available Print Drivers http://www.support.xerox.com/support/WC7655_WC7665/support/en_US.html?objGUID=7601
Solutions for : How To Configure a Custom Paper Size in the Microsoft Windows Print Driver http://www.support.xerox.com/support/WC7655_WC7665/support/en_US.html?objGUID=4848
If that does not resolve your issue you may consider using our "Contact an experienced service technician" at the following link: Fast Track to the Expert
Forgot to mention tray 6 shows fine in the web interface just not the client driver.
We have a 7675 and for some reason the high capacity tray 6 isn’t reporting its contents or availability to the GPD. Trays 1 through 5 show correctly but even though tray 6 shows in the installable options (through SNMP), it won’t show in the driver interface. The paper type installed in tray 6 won’t be available either. We have tried multiple GPD versions and get the same result. The Xerox is connected over TCP/IP through a 2008R2 print server that and we also have several other Xeroxes using the same GPD and they work. I have tried connecting directly to the printer and get the same result. Any ideas?