When a Sim knocks on my door, I use the "Invite In" option. My sim goes onto the patio, has a quick conversation with the visitor (and executes the invite in action) and then goes back inside. My visitor cannot come in the house even though he/she was invited. They just stand on the patio waving their arms with the "cannot get there" bubble above their heads. I have tried every combination of door locking. The only thing that works is to completely unlock my door, which then allows everyone in the neighborhood to just walk in. This didnt used to be an issue, any help is appreciated.
