Not sure if anyone is still having this issue so I'll add what worked for me!
1- Make sure you comb through your mod folder in case you missed a duplicate. I also recommend getting a mod manager to view merged files. if you use the sims resource's mod installer you may have some merged files.
2- Clear the cache file
3- Remove all mods from the mod folder onto your desktop temporarily and start the game.
4- In the menu, disable cc and mods. close the game and restart it again. (this will be quick without mods usually) confirm that the loading screen is now default.
5- Re-enable cc and mods and close the game again.
6- take the file for your new loading screen and put it into your mods folder ALONE. Start your game and make sure it works.
7- Close your game, copy/paste all your mods back into the mods folder. You will likely have a duplicate resource.cfg file. Do not use the old one that you moved. use the one that the mods folder regenerated. (it'll say there's already a file named resource.cfg so you will click to skip that file when moving the mods.)
8- Start your game again and the issue should be solved.
You could "probably" make this work skipping some steps but I am not sure, so I'm just sharing exactly what I did to fix the problem, however tedious it may be.
Hope this helps!
Hi this did help, if anyone has the same problem use this step and you should be able to get your OG loading screen back or a new one.
