diff -crB mag1323/app/code/core/Mage/Admin/Model/Observer.php mag1323-PATCH/app/code/core/Mage/Admin/Model/Observer.php
*** mag1323/app/code/core/Mage/Admin/Model/Observer.php	2009-07-23 06:27:17.000000000 +0100
--- mag1323-PATCH/app/code/core/Mage/Admin/Model/Observer.php	2015-02-11 15:23:31.000000000 +0000
***************
*** 37,42 ****
--- 37,45 ----
      {
          $session  = Mage::getSingleton('admin/session');
          /* @var $session Mage_Admin_Model_Session */
+         /**
+          * @var $request Mage_Core_Controller_Request_Http
+          */
          $request = Mage::app()->getRequest();
          $user = $session->getUser();
  
***************
*** 55,61 ****
                      $user = $session->login($username, $password, $request);
                      $request->setPost('login', null);
                  }
!                 if (!$request->getParam('forwarded')) {
                      if ($request->getParam('isIframe')) {
                          $request->setParam('forwarded', true)
                              ->setControllerName('index')
--- 58,65 ----
                      $user = $session->login($username, $password, $request);
                      $request->setPost('login', null);
                  }
!                 if (!$request->getInternallyForwarded()) {
!                     $request->setInternallyForwarded();
                      if ($request->getParam('isIframe')) {
                          $request->setParam('forwarded', true)
                              ->setControllerName('index')
diff -crB mag1323/app/code/core/Mage/Core/Controller/Request/Http.php mag1323-PATCH/app/code/core/Mage/Core/Controller/Request/Http.php
*** mag1323/app/code/core/Mage/Core/Controller/Request/Http.php	2009-07-23 06:28:42.000000000 +0100
--- mag1323-PATCH/app/code/core/Mage/Core/Controller/Request/Http.php	2015-02-11 15:24:37.000000000 +0000
***************
*** 56,61 ****
--- 56,68 ----
  
      protected $_directFrontNames = array();
      protected $_controllerModule = null;
+     
+     /**
+      * Flag for recognizing if request internally forwarded
+      *
+      * @var bool
+      */
+     protected $_internallyForwarded = false;
  
      public function __construct($uri = null)
      {
***************
*** 391,394 ****
--- 398,423 ----
          }
          return $this->getActionName();
      }
+     
+     /**
+      * Define that request was forwarded internally
+      *
+      * @param boolean $flag
+      * @return Mage_Core_Controller_Request_Http
+      */
+     public function setInternallyForwarded($flag = true)
+     {
+     	$this->_internallyForwarded = (bool)$flag;
+     	return $this;
+     }
+     
+     /**
+      * Checks if request was forwarded internally
+      *
+      * @return bool
+      */
+     public function getInternallyForwarded()
+     {
+     	return $this->_internallyForwarded;
+     }
  }
\ No newline at end of file