The wing flaps jammed in the mid range position. The parachutist on board exited the airplane and the pilot returned for a landing. He extended the traffic pattern and while on base leg, the engine lost power. He was unable to get the engine restarted and was beyond gliding distance to the airport. The pilot executed an off airport landing in a field, downwind. The faa reported the flaps were jammed due to a broken flap support on the inboard left flap track and the engine was test run satisfactory after the accident. Fuel was reported to be at the 1/4 level. The power loss was attributed to the fuel selector being improperly position.