Sims 3 vampire problems?

[CharlieChomper]

I think my Sims3 game is trying to tell me something (ie don't play or else perhaps it's just trying to get me to spend more time on Sims2 when I have time to play?) or else I seem to have run into yet another annoying "glitch"? :

I turned one of my sims into a vampire (single sim household) yet despite having purchased the potion to turn her back into a "normal" sim (purchased from the science center), instead she just "freezes" while holding the potion and nothing happens other than her motives decay. The neighborhood this is happening in is Isla Paradiso (hopefully spelled correctly?). Is there a some type of bug involving supernaturals or vampires in this game or something?

Alternatively, is there some other way for me to turn her back into a normal sim again? I've also tried the cure elixir (and potent cure elixir) to no avail.

I have absolutely no mods in my game whatsoever, but thought to ask in case anyone has any ideas.

[Kiri]

I have no idea CC - I'm into Sims2 (and Sims1) actually. Sims3 just doesn't grip me. I've tried it again recently and I remained un-gripped.

[Whitnerd]

I've only ever used the Potent Cure Exilir (and the MasterController if I'm in a situation where I don't mind cheating a bit). I haven't heard of such a bug. Sorry.

[CharlieChomper]

Thank you both!

My sim tried to make just a simple cure elixir (I've tried several in the past along with potent ones to no avail), but for some reason it actually appears to have worked this time around for some reason.

Also, when I can get some time for it, I hope to get some screenshots posted of what I've been working on in Sims2 as I've been on a massive building spree in that game when I've had time to play.