With mortgage interest rates touching 50-year lows, the volume of new business at Fannie Mae and Freddie Mac struggled to gain positive traction during the third quarter, according to a new market analysis and ranking based on the Inside Mortgage Finance GSE MarketScope. The two government-sponsored enterprises churned out $177.2 billion of new single-family mortgage-backed securities during the three months ending in September. That was up 14.3 percent from the second quarter, but it still ranked as the second-lowest production level since financial markets tanked at the end of 2008. And it left GSE single-family business volume so...(Includes one data chart)