The whole save file. It was a six generation family, at that. When he transformed, everything froze, and people disappeared. I worked through that part of the glitch...managing to get my entire family to show up (don't ask me how...it was mostly luck, and saving in the right place, and a whole lotta reloading and trying something different), but my IF/Vampire YA never fully became a vampire. His needs were still green, instead of the vampire purple, but he behaved like a vampire. And even though I got past the main glitch, every few minutes, my people would "pop" outside. One minute everyone is in bed, the next everyone is standing around outside. It was especially a problem when the family tried to attend graduation. I eventually gave up on the family.
