Sim invisible except for the Plumbob?

Thanks to you all for your insightful replies! At least I know more of what not to do. I don't have any CC in Sims2, but I will try the suggestions about bulldozing, moving to another lot, etc. The couple in question are Max Flexor and Mitch Indie and it was Max who became invisible. I just stopped playing that game entirely and have had no problems with other Sims2 games. But will take your advice to heart. And I probably won't even do CC at all with Sims2. I don't see the need. I don't use it with Sims 3, either, but use a lot of Store content.

Thanks again for helping me learn what to do and what not to do in Sims2! It's a great game, worth navigating around its quirks.