Most anybody in the mortgage business will tell you that August was a month that will live in infamy: The market was in turmoil, as doubts about the stability of subprime loans spread to other sectors of the mortgage world. How bad was it? A survey of mortgage brokers suggests that one in three consumers who recently signed purchase contracts canceled in August -- up from just 4 percent three years ago, according to the research firm that conducted the survey for Inside Mortgage Finance, a trade journal. The cancellation rate undoubtedly was fed by two scenarios playing out: Many...