Known Bugs

[Roanon]

No, you cannot load more onto a ship with full cargo in non-sim games, but it should not stop executing all orders thereafter and just ignore the load order instead.
And yes, I can confirm Fyron's tip - with my limited experience. In larger games - like NGC3 - it is almost certain that a trade does not work if the confirm message is written at the start of the turn. I has not failed yet when writing the message as Last action.