Okay. Try next making a new save and test that.
Sometiimes loading an earlier version of a save will work. If you want to reconstruct a save, more or less, I've done that before. What I did - and note here that I play rotationally, so this was pretty involved - was save all the households and lots that I wanted to my Library so they would keep their increased skills, careers, and within-household relationships. I also wrote down the clubs and interhousehold relationships that mattered most to me. Then I imported the households and lots into the new save. After that, I used clubs to help SIms "meet" each other again (you can then delete those clubs-of-convenience) and UI Cheats Extension to re-create relationship levels.
Ah, thank you very much... Will try and do the earlier save before I do anything, but thank you for helping with the solution! I was worried it was my PC acting up!
