That is very unique and I genuinely have no idea where would this error even begin to form :/. Sometimes, when it comes to seating dolls down, it has been previously reported that the game acts strange if you play at the 30 fps limit. I recommend trying to play on 60, and see if that helps the seating. It is nice to hear you made it to Bella, but when it comes to the fatal error, that happens when you read the document while holding item, that is seriously baffling to me, and I am sorry to say that I have 0 idea on how to work around this one.