My vampire sims aren't able to bite anyone, or to kill anyone. (Using that mod from Shaklin.) They used to be able to, and if I use another sim to influence them to, it still works. But when I click on another sims, the option to bite just isn't there. I don't know if it matters, but as far as hacks pertaining to vampires go, I have:
Vamp Daytime Indoors Decay Hack (That is the longest name ever!

)
Vampire and Werewolf FixesVampire SunblockVampires Walk Normal