Thank you for your response!
The only mod I had was a tuning thing that allowed all sims to livestream, regardless of whether they were in the Gaming career. If I have this problem again, I'll remove it. As it is, when I couldn't find any cheats or debug codes for resetting the lot, I decided to quit without saving. Next time, I'll save the game before trying the adoption thing. When I loaded the save up again, I immediately put the cat that kept having kittens (there were seven cats in that house at one point) up for adoption, and there were no problems. Maybe doing adoptions back to back caused a snag..
@Smellincoffee I'm glad that worked for you and that your game is working well now! Have fun! 🙂
