While some of the properties are newer on the market the real reason the number of listings increased is mostly from Fannie Mae owned mortgages going through the short sale process being kicked back into the market due to
over the market value counter offers regarding what Fannie Mae is willing to accept as a short fall on a short sale.
The rules govern margins that reflect daily changes in
market value in bilateral trades, which are done
over the
counter; and do not go through clearing - houses, and they can raise the cost of such trades.