An imaging apparatus including a media supply, a transport path, a supply path for transporting sheets of photothermographic imaging media from the media supply to the transport path, a drive roller driving sheets of imaging media along the supply path, and a media guide moveable from a normally closed position to an open position to provide a continuous surface for moving a sheet of imaging media from the supply path onto the transport path in a first direction along the transport path, and wherein the media guide is moveable from the open position to the normally closed position upon the entire sheet of imaging media being moved onto the transport path to block the sheet of imaging media from entering the supply path when moving along the transport path in a direction opposite the first direction.