@Tiff812 So I did some testing on your save and I'm afraid, removing the duplicate world corrupts the save game. I tried a few things but I don't know what exactly is happening and why the game corrupts.
My suggestion is to go back to your save with the double world and play like maybe a few Sims week with it, then try removing again. It could also be that simply removing that particular pack is not working cause there's to many tie-ins if you played a save with HSY installed, especially if you have many teens.
At this point, the only proper solution is to move everyone to a new save game which of course has a lot of downsides but I simply don't have another solution.
