ownership

I edit products, and after saving, once in a while I get this error on a white screen. It happens only on LS. /admin/index.php?route=catalog/product/edit&user_token=Vd8vKvlITmnAxnjSNK81zlMPYbVjGBJi&product_id=23038 Therefore, during working hours I must switch to Apache so the owners can...