Printer.Duplex - network printer problem

I am having a problem that is driving me mad. Attempting to add a printer setup dialog to an application, however on certain network printers I cannot set Printer.Duplex to printDlg.Duplex.
It does work on some of the printers but not on others.
The network is WindowsXP and most of the printers are on the same server. I'm sure that many will recognize the code below, as it's the same code that exists on many of VB help forumns.

Private Sub UserPrinterSelect()
Dim NewPrinterName As String
Dim objPrinter As Printer
Dim strsetting As String

Dim printDlg As PrinterDlg
Set printDlg = New PrinterDlg

' Set the starting information for the dialog box based on the current printer settings.
printDlg.PrinterName = Printer.DeviceName
printDlg.DriverName = Printer.DriverName
printDlg.Port = Printer.Port
printDlg.Copies = Printer.Copies
printDlg.Orientation = Printer.Orientation
printDlg.PaperBin = Printer.PaperBin



printDlg.Flags = cdlPDPrintSetup
Printer.TrackDefault = False


If Not printDlg.ShowPrinter(Me.hwnd) Then
Debug.Print "Cancel Selected"
Exit Sub
End If


' Locate the printer that the user selected in the Printers collection.
NewPrinterName = UCase$(printDlg.PrinterName)
If Printer.DeviceName <> NewPrinterName Then
For Each objPrinter In Printers
If UCase$(objPrinter.DeviceName) = NewPrinterName Then
Set Printer = objPrinter
End If
Next
End If

' Copy user input from the dialog box to the properties of the selected printer.
Printer.Copies = printDlg.Copies
Printer.Orientation = printDlg.Orientation
Printer.Duplex = printDlg.Duplex


I also have tried:
Printer.Duplex = 1
Printer.Duplex = 2
Printer.Duplex = 3
All the values are valid but only 1 is accepted by the Print object.

I know that there has to be a way for me to set this property. I can do whatever I want in Word and Excel and it works.

Any ideas would be greatly appreciated... (and please keep it simple.. old programmer, new to VB)