Index: branches/RC/core/kernel/application.php
===================================================================
diff -u -N -r10779 -r10780
--- branches/RC/core/kernel/application.php	(.../application.php)	(revision 10779)
+++ branches/RC/core/kernel/application.php	(.../application.php)	(revision 10780)
@@ -326,6 +326,8 @@
 		}
 
 		$this->HttpQuery->AfterInit();
+		
+		$this->Session->ValidateExpired();
 
 		if( defined('DEBUG_MODE') && $this->isDebugMode() ) {
 			$this->Debugger->appendTimestamp('Processed HTTPQuery AfterInit');
@@ -1148,21 +1150,21 @@
 	* @param string $var Variable name
 	* @param mixed $val Variable value
 	*/
-	function StoreVar($var, $val)
+	function StoreVar($var, $val, $optional = false)
 	{
 		$session =& $this->recallObject('Session');
-		$this->Session->StoreVar($var, $val);
+		$this->Session->StoreVar($var, $val, $optional);
 	}
 
 	function StorePersistentVar($var, $val)
 	{
 		$this->Session->StorePersistentVar($var, $val);
 	}
 
-	function StoreVarDefault($var, $val)
+	function StoreVarDefault($var, $val, $optional=false)
 	{
 		$session =& $this->recallObject('Session');
-		$this->Session->StoreVarDefault($var, $val);
+		$this->Session->StoreVarDefault($var, $val, $optional);
 	}
 
 	/**
@@ -1179,11 +1181,11 @@
 	* @param mixed $ses_var Session variable name
 	* @param mixed $default Default variable value
 	*/
-	function LinkVar($var, $ses_var = null, $default = '')
+	function LinkVar($var, $ses_var = null, $default = '', $optional = false)
 	{
 		if (!isset($ses_var)) $ses_var = $var;
 		if ($this->GetVar($var) !== false) {
-			$this->StoreVar($ses_var, $this->GetVar($var));
+			$this->StoreVar($ses_var, $this->GetVar($var), $optional);
 		}
 		else {
 			$this->SetVar($var, $this->RecallVar($ses_var, $default));