Okay, so wtf is going on here?
I am currently playing an apartment. Their neighbours have a problem: neither Kevin nor Jane can enter their apartment, it seems. The door is supposed to be white. When I played them, Castor and Ashley next door had the same problem (well, Castor had), but as Ashley was still inside the house I was able to fix it by “Visit them” (Castor was then able to enter the flat).
Never mind… unlocking the door helped.
aondaneedles 