Ok so I downloaded Pyronium3's world Serta. After I created my family and tried to place them in a house my game crashed. I deleted my cache files, started the game up and tried again, same thing. So, I went to Sunset Valley just to see if maybe it was a problem with Serta and it did work! I was able to put my sim family into a house with no problem. But I want to play in the city, so I then went to Bridgeport and like before, it crashed when I moved the family from the library to a house. I thought maybe I needed to play with an EA world but apparently that's not the case. My system exceeds the requirements, so that can't be the issue. But why can't I place any families to an empty lot in a city world?