Re: My Sims/walls/floors turned black

@NeverDoubt93  There's nothing obvious in your dxdiag other than a bunch of Adobe-related errors.  That shouldn't have anything to do with Sims 4, of course, but if Adobe is crashing or lagging, you might want to look into those.

For this one save, are the backups affected too?  Here's how to recover one:

https://sims4.crinrict.com/eng/2014/09/recover-backup-save-game/

It's a good idea to make a backup copy of your saves folder now, in case this problem isn't present in the backups (or your other saves) but surfaces later.