# 
#-----[ OPEN ]------------------------------------------ 
# 
login.php 

# 
#-----[ FIND ]------------------------------------------ 
# 
   if( !$userdata['session_logged_in'] || (isset($HTTP_GET_VARS['admin']) && $userdata['session_logged_in'] && $userdata['user_level'] == ADMIN))

# 
#-----[ REPLACE WITH ]------------------------------------------ 
# 
   include_once($phpbb_root_path . 'includes/functions_jr_admin.' . $phpEx); 
   $jr_admin_userdata = jr_admin_get_user_info($userdata['user_id']); 

   if( !$userdata['session_logged_in'] || (isset($HTTP_GET_VARS['admin']) && $userdata['session_logged_in'] && (!empty($jr_admin_userdata['user_jr_admin']) || $userdata['user_level'] == ADMIN))) 

# 
#-----[ OPEN ]------------------------------------------ 
# 
admin/pagestart.php 
# 
#-----[ FIND ]------------------------------------------ 
# 
   redirect(append_sid("login.$phpEx?redirect=admin/&admin=1", true)); 

# 
#-----[ REPLACE WITH ]------------------------------------------ 
# 
   redirect(append_sid("login.$phpEx?redirect=admin/index.$phpEx&admin=1", true)); 
# 
#-----[ SAVE/CLOSE ALL FILES ]------------------------------------------ 
# 
# EoM 

SOURCE : http://www.phpbb2.de/viewtopic.php?p=150639#150639