Sim Disappears When I Place Them On Lot

Hi,

So, as seen by the title, my sim disappears as soon as I place her on a lot. I've checked, she doesn't appear to have any corrupted CC or anything like that. But whenever I move her onto any lot from my library, as soon as I go to play her, she's just... gone. The game loads, but it's as if I'm playing as literally nobody (see attached image). I did notice this started happening when I converted her to a vampire using cheats, so maybe that is causing this... somehow? Help is much appreciated.