I clicked on a location four hexes away to move my colonist there. However, there was a siege worm located nearby. No big deal, right? Wrong! My colonist was moved to a location right next to the siege worm, which subsequently destroyed it, even though there was another path of equal length that avoided the siege worm. This kind of thing is really annoying because it basically means that you have to move units one turn at a time, which increases the tedious micromanagement factor.