Index: /trunk/src/org/openstreetmap/josm/gui/preferences/PreferenceTabbedPane.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/preferences/PreferenceTabbedPane.java	(revision 17733)
+++ /trunk/src/org/openstreetmap/josm/gui/preferences/PreferenceTabbedPane.java	(revision 17734)
@@ -463,5 +463,5 @@
      */
     public PreferenceTabbedPane() {
-        super(SwingConstants.LEADING, JTabbedPane.SCROLL_TAB_LAYOUT);
+        super(SwingConstants.LEFT, JTabbedPane.SCROLL_TAB_LAYOUT);
         super.addMouseWheelListener(new WheelListener(this));
         ExpertToggleAction.addExpertModeChangeListener(this);