Unanticipated complications with the Dodd-Frank Act appear to have caused Fannie Mae and Freddie Mac to miss a Sept. 30 deadline set by the Federal Housing Finance Agency to initiate risk-sharing transactions with non-agency investors. However, FHFA officials said they continue to work with the government-sponsored enterprises on the issue. “Risk sharing is a complex process that requires time to assess market opportunities, structural considerations, make operational changes, and develop proper risk metrics and controls,” an FHFA spokesman said. “We are moving forward steadily and expect to continue making progress in the coming months.” FHFA officials would not comment...