Index: trunk/src/org/openstreetmap/josm/gui/MapView.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/MapView.java	(revision 10438)
+++ trunk/src/org/openstreetmap/josm/gui/MapView.java	(revision 10440)
@@ -65,4 +65,5 @@
 import org.openstreetmap.josm.gui.layer.MapViewPaintable.PaintableInvalidationEvent;
 import org.openstreetmap.josm.gui.layer.MapViewPaintable.PaintableInvalidationListener;
+import org.openstreetmap.josm.gui.layer.NativeScaleLayer;
 import org.openstreetmap.josm.gui.layer.OsmDataLayer;
 import org.openstreetmap.josm.gui.layer.geoimage.GeoImageLayer;
@@ -597,4 +598,7 @@
             playHeadMarker = PlayHeadMarker.create();
         }
+        if (layer instanceof NativeScaleLayer) {
+            setNativeScaleLayer((NativeScaleLayer) layer);
+         }
 
         ProjectionBounds viewProjectionBounds = layer.getViewProjectionBounds();