When capturing the pirate ships in 19. Watch that first step, using the unload hotkey has no effect. To use unload you have to click the button and be next to the shore. Also it doesn’t work if you are transporting them people to the other side of the map. You have to be next to the shore VERY close or the ships just go a quarter of the map and stop.
EDIT: My bad. the no attack key (V) was my unload hotkey (V). I fixed this problem by unbinding the no attack stance, which I rarely use anyway.