In my current game, my civilian shipping lines seem to have decided that the best thing to do is leave all their freighters and colony ships in Earth orbit, rather than running the incredibly lucrative Earth-Mars trade route. Both planets are sitting there with huge stocks of goods the other planet wants, and I've got a few outsystem colonies that would like some infrastructure, but the freighters don't seem to care. Going through and clearing all the orders seemed to work once, but after a trip or two they went right back to idling. I'm not really sure what's going on with this.
