I know this problem has been raised many times; however, I have a specific condition in which it occurred. I had the waypoint for my factory set to my capitalship (which was the only ship in fleet 1). I had about 10 frigs qued, but my capital ship died. All the ships produced that were set to the fleet waypoint went screwy. Many just ended up moving from my homeworld to the point that the ship died, but didn't attempt to use jump lane.