Walter Investment Management Corp. has yet to release fourth-quarter results, but if its nine-month performance is any indication, it has some major challenges ahead. Through September, the publicly traded nonbank – the nation’s eighth-largest servicer via its Ditech unit – lost $506.9 million, some of it tied to non-cash writedowns on its mortgage servicing rights. But if revenues are any indication of future earnings, investors shouldn’t brace for too much good news in its ...