Index: /trunk/src/org/openstreetmap/josm/gui/bbox/TileSelectionBBoxChooser.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/bbox/TileSelectionBBoxChooser.java	(revision 4515)
+++ /trunk/src/org/openstreetmap/josm/gui/bbox/TileSelectionBBoxChooser.java	(revision 4516)
@@ -540,5 +540,5 @@
                 return false;
             }
-            if (x < 0 || x >= Math.pow(2, zoom -1)) return false;
+            if (x < 0 || x >= Math.pow(2, zoom)) return false;
             int y;
             try {
@@ -547,5 +547,5 @@
                 return false;
             }
-            if (y < 0 || y >= Math.pow(2, zoom -1)) return false;
+            if (y < 0 || y >= Math.pow(2, zoom)) return false;
 
             tileBounds = new TileBounds(new Point(x,y), new Point(x,y), zoom);