Printing in TUMBLE mode not working

Question

hello,
I have the problem that the TUMBLE mode does not work in my program.
I have tested the printer with MS Word to be sure it works with my hardware and
it succeeded.
I use a DocPrint Object and specified the PrintRequestAttributeSet attributes OrientationRequested.LANDSCAPE and Sides.TUMBLE (=Sides.TWO_SIDED_SHORT_EDGE).
If I change this to Sides.ONE_SIDED, the printer correctly prints each pair of sides on 2 papers (one-sided).
If I change this to Sides.DUPLEX, the printer prints in DUPLEX mode correctly (TWO_SIDED_LONG_EDGE)
If I change this to Sides.TUMBLE, it still prints in DUPLEX !
If I use OrientationRequested.PORTRAIT, the printer prints always binding to the short side , like I need it (no matter if I switch to DUPLEX or TUMBLE).
What could be the reason that the program ignores the TUMBLE attribute ?
Here is my code:
public static void doPrint(Print printData)  throws Exception {
                PrintService printer = null;     
          printer = printerLookup(printerName);                         
          DocPrintJob job = printer.createPrintJob();
          DocFlavor flavor = DocFlavor.SERVICE_FORMATTED.PRINTABLE;
                Doc doc = new SimpleDoc(printData, flavor, null);
                PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
          aset.add(OrientationRequested.LANDSCAPE);               
          aset.add(Sides.TWO_SIDED_SHORT_EDGE);
             job.print(doc, aset); //print
}

Answer 1

Yes, it's not a permission issue. And it only happens on this one machine too. No error messages in any of the log files. This is a real tough one. I'm tempted to think that it might be a graphics driver issue. The machine with the problem is a 2008 Mac Pro with a GeForce 8800 GT. So if anyone with a similar configuration could test it I'd at least have another hint for what's going on.
As an interesting sidenote, other capture applications like Voila work fine, which makes the graphics driver theory unlikely, but well, I'm running out of possible causes.
Thanks,
Jazz