The Sims 3 Bridgeport-Roaring heights save problem

@Asliis  If you load the older save, are you back in Bridgeport?  It's possible that the problem is the metadata, in this case the thumbnail, rather than the entire save.  So please have a look.

If you load this save and you see anything other than your intact Bridgeport world, quit without saving.  Go into Documents > Electronic Arts > The Sims 3 > Saves and find the folder lableled Bridgeport.sims3.backup, or whatever your save was called.  Rename the folder (e.g. Bridgeport1) and delete the .backup extension, so the folder name ends in .sims3 , and this backup will be available to load from the Main Menu.

For future reference, there is only one non-mod-related safe way to move a sim from one neighborhood to another.  That's to save the sim to the bin, without their house (you can save the house separately), quit, reload the game, start a new save in the new world, and place your sim there.  Using the in-game mechanic risks imposing data from the old world on the new one, thereby corrupting the save.