Index: /CKEditor/trunk/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 3314)
+++ /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 3315)
@@ -2159,6 +2159,7 @@
 
 			tabId = cursor.getAttribute( 'name' );
-
-			this._.dialog.selectPage( tabId );
+			// Avoid duplicate select.
+			if ( !this._.dialog._.currentTabId == tabId )
+				this._.dialog.selectPage( tabId );
 			return this;
 		},