Index: branches/RC/core/install.php
===================================================================
diff -u -r11623 -r11711
--- branches/RC/core/install.php	(.../install.php)	(revision 11623)
+++ branches/RC/core/install.php	(.../install.php)	(revision 11711)
@@ -154,7 +154,7 @@
 
 			if (!$this->toolkit->getSystemConfig('Misc', 'WriteablePath')) {
 				// set global writable folder when such setting is missing
-				$this->toolkit->setSystemConfig('Misc', 'WriteablePath', '/system');
+				$this->toolkit->setSystemConfig('Misc', 'WriteablePath', DIRECTORY_SEPARATOR . 'system');
 				$this->toolkit->SaveConfig(true); // immediately save, because this path will be used in Application later
 			}
 
@@ -687,7 +687,7 @@
 					$config_values = Array (
 						'RootPass' => $password,
 						'Site_Path' => BASE_PATH.'/', // set Site_Path (for SSL & old in-portal code)
-						'Backup_Path' => FULL_PATH . $this->toolkit->getSystemConfig('Misc', 'WriteablePath') . '/backupdata',
+						'Backup_Path' => FULL_PATH . $this->toolkit->getSystemConfig('Misc', 'WriteablePath') . DIRECTORY_SEPARATOR . 'backupdata',
 						'Smtp_AdminMailFrom' => 'portal@' . $this->toolkit->getSystemConfig('Intechnic', 'Domain')
 					);