I am trying to use a ProgressMonitor, but it never appears on the screen.  I initialize it like:
        self.mon = ProgressMonitor(self.parent,
                                  "Processing " + self.task.shortfilename ,
                                  "", 0, self.task.filesize);
        self.mon.setProgress(0);
        self.mon.setMillisToDecideToPopup(0)
        self.mon.setMillisToPopup(100)

..but it doesn't show up.  any ideas?