"Content Not Installed"?

This same thing is happening to me on the XBox version. I hadn't played in a month or so; now when I sign in and load a saved game, it is telling me that content is not installed. I have the Cats and Dogs pack clearly installed, but the household now doesn't even show it available. I even uninstalled and reinstalled that pack from the disc, and still nothing. I think a recent update broke something.