@puzzlezaddict I created a new Meta.data file by making a new save file a couple days ago (while my messed up saves were still there). I put a copy of it in each .sims3 folder. Doing so brought me from "Cannot load this save game. It may have been saved with expansion pack data that is no longer present on this system." to "A serious error has occurred while loading '[savename].sims3'. It is strongly recommended that you restart the application." once I was able to select my save file. Two things to note: 1: the new save that I got the new Meta.data from showed CC in build mode and NRaas on city hall so the mods and CC were working; 2: on the main menu, any old save with the new Meta.data in it will show the name when the cursor is over it, not have a photo (neither fam or house), and the description and title will be of the family I created the Meta.data file with rather than the actual save's family.
I tried loading the backup in a new user folder but it said the whole thing about how it might've been saved with expansion data that's no longer there so it can't load. Because of that I tried the Meta.data thing which brought up the "serious error" box. At that point I decided to look in the new save folder that I got the Meta.data from and noticed another file named "1a5tf1l3.dat", so I put that into the save file I had put in the new user folder and it worked! The game loaded and everything. The only thing is I think that's the one family I didn't use CC or mods with yet. However after a couple of minutes of looking around on pause, I went to the family's penthouse, went up a level, and the screen turned red. It literally pulsated red like a strobe light 😭 I panicked but was able to go to map, so then I went back to the penthouse and it was on the floor I was trying to go to, which has a red room in it. I think that was where the red came from. I changed levels again and it went red again, and then it froze so I force quit the game.
I tried to load a different family that uses CC and mods and it would start loading but not finish. I tried a few times. It always seemed like it was gonna work because the bar would start filling and I could play with the loading screen, but it never reached halfway and would just stop. The music would still play though. Maybe if I wait for 20+ minutes it'll load 💀😭 I did that before, like 2 years ago.
Any ideas? I'm stumped. (sorry this is so long lol)