when admin follow the link, the link is (i give with sid, maybe it's important):
..../admin/admin_users.php?mode=edit&u=2&sid=5aa903e8f65006b566a381af42ca4e66
but i am redirected to:
..../login.php?redirect=admin/&sid=a86b040cb056c45732c8eae67a8afa14

