Index: src/org/openstreetmap/josm/actions/DownloadAction.java
===================================================================
--- src/org/openstreetmap/josm/actions/DownloadAction.java	(revision 408)
+++ src/org/openstreetmap/josm/actions/DownloadAction.java	(working copy)
@@ -65,5 +65,8 @@
         	if (!finish)
         		JOptionPane.showMessageDialog(Main.parent, tr("Please select at least one task to download"));
         }
+        
+                dialog = null;
+                dlg.dispose();
 	}
 }