I am running Windows 7 x64. The 6600DN does print Xerox documents from the Control Panel, ie. Demo pages
and Configuration Report in Duplex; this indicates the Duplex Unit does operate. However, printing duplex
using the print driver no longer functions. I have used the Xerox Global Print Driver PCL6, both the current
version from the website and an older version, V3.8.496.7.0.
If anyone has any ideas ,I would be most appreciative.