Index: /trunk/src/org/openstreetmap/josm/gui/layer/OsmDataLayer.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/layer/OsmDataLayer.java	(revision 682)
+++ /trunk/src/org/openstreetmap/josm/gui/layer/OsmDataLayer.java	(revision 683)
@@ -199,4 +199,6 @@
 			data.dataSources.add(src);
 		fireDataChange();
+		// repaint to make sure new data is displayed properly.
+		Main.map.mapView.repaint();
 		
 		if (visitor.conflicts.isEmpty())