Index: lams_central/src/java/org/lamsfoundation/lams/web/HomeAction.java
===================================================================
diff -u -r7a1f51f64555f4cd94274847196373c7f9f549f0 -r1a4d1ede9ffb27ba31da22ed4e2ff7bc3137fddc
--- lams_central/src/java/org/lamsfoundation/lams/web/HomeAction.java	(.../HomeAction.java)	(revision 7a1f51f64555f4cd94274847196373c7f9f549f0)
+++ lams_central/src/java/org/lamsfoundation/lams/web/HomeAction.java	(.../HomeAction.java)	(revision 1a4d1ede9ffb27ba31da22ed4e2ff7bc3137fddc)
@@ -231,6 +231,10 @@
 			HttpServletRequest req, HttpServletResponse res)
 			throws IOException, ServletException {
 		req.getSession().invalidate();
+		
+		//clear system shared session.
+		SessionManager.getSession().invalidate();
+		
 		return mapping.findForward("index");
 	}
 }
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