diff --git a/phpgwapi/inc/class.egw.inc.php b/phpgwapi/inc/class.egw.inc.php
index 1373db40bb..555ba77443 100644
--- a/phpgwapi/inc/class.egw.inc.php
+++ b/phpgwapi/inc/class.egw.inc.php
@@ -117,14 +117,17 @@ class egw extends egw_minimal
 			}
 			exit;
 		}
-		// Set the DB's client charset if a system-charset is set
-		$system_charset = $GLOBALS['egw_info']['server']['system_charset'] = $this->db->select(config::TABLE,'config_value',array(
+		// Set the DB's client charset if a system-charset is set and some other values needed by egw_cache (used in config::read)
+		foreach($GLOBALS['egw_info']['server']['system_charset'] = $this->db->select(config::TABLE,'config_name,config_value',array(
 			'config_app'  => 'phpgwapi',
-			'config_name' => 'system_charset',
-		),__LINE__,__FILE__)->fetchColumn();
-		if ($system_charset)
+			'config_name' => array('system_charset','install_id','temp_dir'),
+		),__LINE__,__FILE__) as $row)
 		{
-			$this->db->Link_ID->SetCharSet($system_charset);
+			$GLOBALS['egw_info']['server'][$row['config_name']] = $row['config_value'];
+		}
+		if ($GLOBALS['egw_info']['server']['system_charset'])
+		{
+			$this->db->Link_ID->SetCharSet($GLOBALS['egw_info']['server']['system_charset']);
 		}
 		// load up the $GLOBALS['egw_info']['server'] array
 		$GLOBALS['egw_info']['server'] += config::read('phpgwapi');
diff --git a/phpgwapi/inc/class.egw_cache.inc.php b/phpgwapi/inc/class.egw_cache.inc.php
index b23ad11c3c..c669f639da 100644
--- a/phpgwapi/inc/class.egw_cache.inc.php
+++ b/phpgwapi/inc/class.egw_cache.inc.php
@@ -452,7 +452,7 @@ class egw_cache
 	 * @param boolean $throw=true throw an exception, if we can't retriev the value
 	 * @return string|boolean string with config or false if not found and !$throw
 	 */
-	static protected function get_system_config($name,$throw=true)
+	static public function get_system_config($name,$throw=true)
 	{
 		if(!isset($GLOBALS['egw_info']['server'][$name]))
 		{
diff --git a/phpgwapi/inc/class.egw_cache_files.inc.php b/phpgwapi/inc/class.egw_cache_files.inc.php
index 97353f0cbe..7fc1161a52 100644
--- a/phpgwapi/inc/class.egw_cache_files.inc.php
+++ b/phpgwapi/inc/class.egw_cache_files.inc.php
@@ -45,21 +45,7 @@ class egw_cache_files implements egw_cache_provider
 		}
 		else
 		{
-			if(!isset($GLOBALS['egw_info']['server']['temp_dir']))
-			{
-				if (isset($GLOBALS['egw_setup']) && isset($GLOBALS['egw_setup']->db))
-				{
-					$GLOBALS['egw_info']['server']['temp_dir'] = $GLOBALS['egw_setup']->db->select(config::TABLE,'config_value',array(
-						'config_app'	=> 'phpgwapi',
-						'config_name'	=> 'temp_dir',
-					),__LINE__,__FILE__)->fetchColumn();
-				}
-				if (!$GLOBALS['egw_info']['server']['temp_dir'])
-				{
-					throw new Exception (__METHOD__."() server/temp_dir is NOT set!");
-				}
-			}
-			$this->base_path = $GLOBALS['egw_info']['server']['temp_dir'].'/egw_cache';
+			$this->base_path = egw_cache::get_system_config('temp_dir').'/egw_cache';
 		}
 		if (!isset($this->base_path) || !file_exists($this->base_path) && !mkdir($this->base_path,0700,true))
 		{