got a message warning, with the humorous lines of: 06-10:20:24.021 03_20 -LOG- MinDistanceEvent for bookmark id = 18, isBelow: True 06-10:20:24.040 03_20 -EXC- System.ArgumentException: An item with the same key has already been added. Key: 18 this happened in chapter 5, roughly around the transition to 'find maintenance access (level 3)' section I guess it tried to add the bookmark twice? little bit odd, and i'm curious why there aren't checks in place to ensure that a key being added doesn't already exist, heh. i've attached a log, as well.