self.screens.display, is always true, no matter which mode you use (single or dual screen)

self.screens.current['primary'] is true, in single screen mode, or when the operator screen is also used as the main display!

openlp/core/ui/maindisplay.py

@@ -455,6 +455,8 @@ class MainDisplay(DisplayWidget):
                 self.displayText.setPixmap(frame)
             else:
                 self.displayText.setPixmap(QtGui.QPixmap.fromImage(frame))
+        if not self.isVisible() and self.screens.current['primary']: # self.screens.display
+            self.setVisible(True)
 
 class VideoDisplay(Phonon.VideoWidget):
     """