The jumbo mortgage-backed security market has yet to recover from the spike in interest rates seen nearly a year ago. Investor demand for the securities remains weak, even with the pristine performance of jumbo MBS issued since 2010. Four deals were priced in the first quarter of 2014 for a total of $1.29 billion in issuance, according to Inside Nonconforming Markets. While that was a 56.0 percent increase in issuance compared with ... [Includes two data charts]