Because I made the erroneous assumption that since there was another thread pertaining to tech support of other things, I could safely post here...
Anyway, it seems to be connected with an invisible sim, and not any of the addons. I couldn't (discover a way to) delete, kill, or reset this sim, so the 2-hour old OTHER save file had to be reverted to.
Better than starting all over, I suppose.
Thanks for your time.