QPrinter::setOrientation is documented to have no effect during a job on the Mac.

This was a limitation of PMSetOrientation in 10.4, which was lifted in 10.5.

At present QMacPrintEngine::setProperty handles PPK_Orientation by checking to see if the printer is active and if so ignoring the change. This could be changed to:

    case PPK_Orientation: {
        if (d->state == QPrinter::Active && QSysInfo::MacintoshVersion < QSysInfo::MV_10_5) {
            qWarning("QMacPrintEngine::setOrientation: Orientation cannot be changed during a print job, ignoring change");
        } else {
        .....
        }

This would allow Mac OS X 10.5 or higher to behave as per other platforms.