Yeah, I am getting the same naughty behavior. I just kept quiet until now.
The first slew of errors was "Attempt to access non-live pick" for the new version of the added thing, in this case a skill. I like to limit Novice characters to d8 in their skills, so I have the maximum rank increase as the rank increases. However, this required a replacement of the skills. I THINK the error is because it is trying to add the old skill and does not know where the new one is.
The second slew of errors was "Unexpected error occurred when adding pick X to container". Probably for the same reason.
I also have a slightly different version of the Parry trait, basing it off of an Evasion skill instead of Fighting. It will not calculate on imported people.
So, that is why I think that it is having trouble with looking at replaced ids.