Index: branches/5.2.x/core/kernel/application.php
===================================================================
--- branches/5.2.x/core/kernel/application.php
+++ branches/5.2.x/core/kernel/application.php
@@ -1085,11 +1085,10 @@
 	 */
 	public function QuickRun()
 	{
-		// discard any half-parsed content
-		ob_clean();
-
-		// replace current page content with 404
+		// Replace current page content with 404.
 		$this->InitParser();
+
+		$this->Parser->Clear();
 		$this->HTML = $this->Parser->Run($this->GetVar('t'));
 	}
 
Index: branches/5.2.x/core/kernel/nparser/nparser.php
===================================================================
--- branches/5.2.x/core/kernel/nparser/nparser.php
+++ branches/5.2.x/core/kernel/nparser/nparser.php
@@ -140,6 +140,46 @@
 		$this->CachingEnabled = !$this->Application->isAdmin && $this->Application->ConfigValue('SystemTagCache') && $this->Application->isCachingType(CACHING_TYPE_MEMORY);
 	}
 
+	function Clear()
+	{
+		// Discard any half-parsed content.
+		ob_clean();
+
+		$this->Stack = array();
+		$this->Level = 0;
+
+		$this->Buffers = array();
+		$this->InsideComment = false;
+
+		$this->SkipComments = true;
+
+		$this->Params = array();
+		$this->ParamsStack = array();
+		$this->ParamsLevel = 0;
+
+		$this->Definitions = '';
+
+		$this->Elements = array();
+
+		$this->ElementLocations = array();
+
+		$this->DataExists = false;
+
+		$this->TemplateName = null;
+		$this->TempalteFullPath = null;
+
+		$this->CachePointers = array();
+		$this->Cachable = array();
+
+		$this->CacheLevel = 0;
+
+		$this->FullCachePage = false;
+
+		$this->PrefixesInUse = array();
+
+		$this->Captures = array();
+	}
+
 	function Compile($pre_parsed, $template_name = 'unknown')
 	{
 		$data = file_get_contents($pre_parsed['tname']);