Index: trunk/core/units/modules/modules_config.php
===================================================================
diff -u -N -r1566 -r2060
--- trunk/core/units/modules/modules_config.php	(.../modules_config.php)	(revision 1566)
+++ trunk/core/units/modules/modules_config.php	(.../modules_config.php)	(revision 2060)
@@ -5,7 +5,7 @@
 					'ItemClass'			=>	Array('class'=>'kDBItem','file'=>'','build_event'=>'OnItemBuild'),
 					'ListClass'			=>	Array('class'=>'kDBList','file'=>'','build_event'=>'OnListBuild'),
 					'EventHandlerClass'	=>	Array('class'=>'ModulesEventHandler','file'=>'modules_event_handler.php','build_event'=>'OnBuild'),
-					'TagProcessorClass' =>	Array('class'=>'kDBTagProcessor','file'=>'','build_event'=>'OnBuild'),
+					'TagProcessorClass' =>	Array('class'=>'ModulesTagProcessor','file'=>'modules_tag_processor.php','build_event'=>'OnBuild'),
 					'AutoLoad'			=>	true,
 					'hooks'				=>	Array(),
 					'QueryString'		=>	Array(
Index: trunk/kernel/units/modules/modules_config.php
===================================================================
diff -u -N -r1566 -r2060
--- trunk/kernel/units/modules/modules_config.php	(.../modules_config.php)	(revision 1566)
+++ trunk/kernel/units/modules/modules_config.php	(.../modules_config.php)	(revision 2060)
@@ -5,7 +5,7 @@
 					'ItemClass'			=>	Array('class'=>'kDBItem','file'=>'','build_event'=>'OnItemBuild'),
 					'ListClass'			=>	Array('class'=>'kDBList','file'=>'','build_event'=>'OnListBuild'),
 					'EventHandlerClass'	=>	Array('class'=>'ModulesEventHandler','file'=>'modules_event_handler.php','build_event'=>'OnBuild'),
-					'TagProcessorClass' =>	Array('class'=>'kDBTagProcessor','file'=>'','build_event'=>'OnBuild'),
+					'TagProcessorClass' =>	Array('class'=>'ModulesTagProcessor','file'=>'modules_tag_processor.php','build_event'=>'OnBuild'),
 					'AutoLoad'			=>	true,
 					'hooks'				=>	Array(),
 					'QueryString'		=>	Array(
Index: trunk/core/kernel/utility/unit_config_reader.php
===================================================================
diff -u -N -r1834 -r2060
--- trunk/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 1834)
+++ trunk/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 2060)
@@ -32,7 +32,7 @@
 			parent::Init($prefix,$special);
 			
 			$db =& $this->Application->GetADODBConnection();
-			$this->modules_installed = $db->GetCol('SELECT CONCAT(\'/\',Path) AS Path, Name FROM '.TABLE_PREFIX.'Modules','Name');
+			$this->modules_installed = $db->GetCol('SELECT CONCAT(\'/\',Path) AS Path, Name FROM '.TABLE_PREFIX.'Modules WHERE Loaded = 1','Name');
 			$this->scanModules(MODULES_PATH);
 		}
 		
Index: trunk/kernel/units/modules/modules_tag_processor.php
===================================================================
diff -u -N
--- trunk/kernel/units/modules/modules_tag_processor.php	(revision 0)
+++ trunk/kernel/units/modules/modules_tag_processor.php	(revision 2060)
@@ -0,0 +1,15 @@
+<?php
+
+class ModulesTagProcessor extends kDBTagProcessor  {
+
+	function ModuleInstalled($params)
+	{
+		$module = $this->SelectParam($params, 'name,module');
+		$sql = 'SELECT Loaded FROM '.$this->Application->getUnitOption('mod', 'TableName').'
+				WHERE Name = "'.$module.'"';
+		return $this->Conn->GetOne($sql) ? 1 : 0;
+	}
+	
+}
+
+?>
\ No newline at end of file
Index: trunk/core/kernel/event_manager.php
===================================================================
diff -u -N -r1560 -r2060
--- trunk/core/kernel/event_manager.php	(.../event_manager.php)	(revision 1560)
+++ trunk/core/kernel/event_manager.php	(.../event_manager.php)	(revision 2060)
@@ -194,6 +194,14 @@
 		
 		function registerHook($hookto_prefix, $hookto_special, $hookto_event, $mode, $do_prefix, $do_special, $do_event, $conditional)
 		{
+			if( !$this->Application->getUnitOptions($hookto_prefix) )
+			{
+				if($this->Application->isDebugMode())
+				{
+					trigger_error('Prefix <b>'.$hookto_prefix.'</b> doesn\'t exist when trying to hook from <b>'.$do_prefix.':'.$do_event.'</b>', E_USER_WARNING);
+				}
+				return;
+			}
 			$hookto_prefix_special = rtrim($hookto_prefix.'.'.$hookto_special, '.');
 			if ($mode == hBEFORE) {
 				$this->beforeHooks[strtolower($hookto_prefix_special.'.'.$hookto_event)][] = Array(
Index: trunk/core/units/modules/modules_tag_processor.php
===================================================================
diff -u -N
--- trunk/core/units/modules/modules_tag_processor.php	(revision 0)
+++ trunk/core/units/modules/modules_tag_processor.php	(revision 2060)
@@ -0,0 +1,15 @@
+<?php
+
+class ModulesTagProcessor extends kDBTagProcessor  {
+
+	function ModuleInstalled($params)
+	{
+		$module = $this->SelectParam($params, 'name,module');
+		$sql = 'SELECT Loaded FROM '.$this->Application->getUnitOption('mod', 'TableName').'
+				WHERE Name = "'.$module.'"';
+		return $this->Conn->GetOne($sql) ? 1 : 0;
+	}
+	
+}
+
+?>
\ No newline at end of file
Index: trunk/core/kernel/processors/main_processor.php
===================================================================
diff -u -N -r1677 -r2060
--- trunk/core/kernel/processors/main_processor.php	(.../main_processor.php)	(revision 1677)
+++ trunk/core/kernel/processors/main_processor.php	(.../main_processor.php)	(revision 2060)
@@ -715,7 +715,7 @@
 		$module =& $this->Application->recallObject('mod.'.$module_name);
 		$this->Application->SetVar('m_cat_id', $module->GetDBField('RootCat') );
 	}
-		
+
 /*
 	function Login($params)
 	{