The jumbo mortgage-backed security market may be thawing slowly. Credit Suisse this week issued its first security since the end of August, and Redwood Trust issued its latest jumbo MBS this month after a similar pause in securitization activity. The $301.90 million deal by Credit Suisse received an AAA rating from DBRS and Standard & Poor’s with credit enhancement of 7.55 percent on the top-rated tranche. Mortgages in CSMC 2013-IVR5 seasoned for an average of four months and had an average interest rate ...