Island Paradise Lag issue solution (no mods required)

I already use Overwatch, and the Scott family are forever being reset. I read something about the family having been en route for a deleted venue when the world was releaseded, or some such thing.

Your solution seems likely to work - however, is it really necessary to move my sims out and in to the neighbourhood again? I've made a lot of changes to the world, and I'd rather not have to do it all again. Not sure what difference it would really make...