When they moved into the house in November 2005, Kofi was earning $82,740 as an IT consultant for a government contractor, and Comfort, then 43, was making $30,000 as an administrative assistant. But in the overheated mortgage market of the time, they said everyone told them that they could buy a $600,000 house. They made a $60,000 down payment and all their mortgage payments for more than 2½ years — through September 2008. But the house was financed with subprime loans, which reset to higher rates after short time periods, creating what are known as “shock payments.” The Boatengs said...