diff --git a/application/utils.inc.php b/application/utils.inc.php
index 2f972e4fb3..0e2ada5154 100644
--- a/application/utils.inc.php
+++ b/application/utils.inc.php
@@ -155,7 +155,10 @@ class utils
 		}
 		// Read and record the value for switching the archive mode
 		$iCurrent = self::ReadParam('with-archive', $iDefault);
-		$_SESSION['archive_mode'] = $iCurrent;
+		if (isset($_SESSION))
+		{
+			$_SESSION['archive_mode'] = $iCurrent;
+		}
 		// Read and use the value for the current page (web services)
 		$iCurrent = self::ReadParam('with_archive', $iCurrent, true);
 		self::$bPageMode = ($iCurrent == 1);
diff --git a/core/metamodel.class.php b/core/metamodel.class.php
index eb713bf27d..fa1642235e 100644
--- a/core/metamodel.class.php
+++ b/core/metamodel.class.php
@@ -5261,20 +5261,26 @@ abstract class MetaModel
 
 	public static function ResetCache($sEnvironmentId = null)
 	{
-		if (!function_exists('apc_delete')) return;
 		if (is_null($sEnvironmentId))
 		{
 			$sEnvironmentId = MetaModel::GetEnvironmentId();
 		}
 
 		$sAppIdentity = 'itop-'.$sEnvironmentId;
+		require_once(APPROOT.'/core/dict.class.inc.php');
 		Dict::ResetCache($sAppIdentity);
 
-		foreach(self::GetCacheEntries($sEnvironmentId) as $sKey => $aAPCInfo)
+		if (function_exists('apc_delete'))
 		{
-			$sAPCKey = $aAPCInfo['info'];
-			apc_delete($sAPCKey);
+			foreach (self::GetCacheEntries($sEnvironmentId) as $sKey => $aAPCInfo)
+			{
+				$sAPCKey = $aAPCInfo['info'];
+				apc_delete($sAPCKey);
+			}
 		}
+
+		require_once(APPROOT.'core/userrights.class.inc.php');
+		UserRights::FlushPrivileges();
 	}
 	
 	/**
diff --git a/core/userrights.class.inc.php b/core/userrights.class.inc.php
index acfda6efb1..a53f1ac689 100644
--- a/core/userrights.class.inc.php
+++ b/core/userrights.class.inc.php
@@ -1152,8 +1152,16 @@ class UserRights
 			self::$m_aAdmins = array();
 			self::$m_aPortalUsers = array();
 		}
+		if (!isset($_SESSION))
+		{
+			session_name('itop-'.md5(APPROOT));
+			session_start();
+		}
 		self::_ResetSessionCache();
-		return self::$m_oAddOn->FlushPrivileges();
+		if (self::$m_oAddOn)
+		{
+			self::$m_oAddOn->FlushPrivileges();
+		}
 	}
 
 	static $m_aCacheUsers;
diff --git a/setup/runtimeenv.class.inc.php b/setup/runtimeenv.class.inc.php
index c741625d65..abbfbd356c 100644
--- a/setup/runtimeenv.class.inc.php
+++ b/setup/runtimeenv.class.inc.php
@@ -505,7 +505,6 @@ class RunTimeEnvironment
 			SetupUtils::builddir($sCacheDir);
 			SetupUtils::tidydir($sCacheDir);
 
-			require_once(APPROOT.'/core/dict.class.inc.php');
 			MetaModel::ResetCache(md5(APPROOT).'-'.$this->sTargetEnv);
 		}
 	}