I seem to be having similar problems now, too. My mailbox keeps saying no interactions, yet then I get the pop-up saying one day to pay bills. I'm also having issues with the lights in the hallway and foyer of the apartment, they have stopped working, so I keep getting the "It's Dark" moodlet. I did the cheat where you can edit outside the apartment, and moved the lights and set them to on, and they worked for a bit, but now they don't work again. Would move objects cheat work better to fix them and my mailbox? It's a premade apartment, I only altered the windows, but the lights etc weren't working before I did that.