This cause was fixed.
There are still issues with Sims entering your home uninvited and never leaving. See this post for more details: Unwanted Visitors.
- Sims that visit my house never leave
- The interaction Ask to leave is missing
The 2014/12/16 patch is messing lot types of lots uploaded to the gallery.
- Move your family to a different lot
- Open Manage world
- Choose a lot on which you want to place your new house on and go to build mode
- Place the house
- Exit build mode
- Go back to build mode and click on i
- Change the lot type to residential
- Move your family back in
For step by step instructions with pictures, refer to this thread: Step by step instruction on how to get rid of unwanted sims