It's been about 6 months that I've been dealing with this, and I still see no fix/workaround/solution.
Add any of the animations under Animation => Expression => Expression_Loop (such as "Anger_Hi"), and it will always pop up this message:

I've tried this with every character that CC4 provides, with all of the Facial Profile options available, and
every combination still results in this warning, every time I add the Expression, even if I've added that expression before.
- How do I get this message to stop showing up?
- What is in the iTalk files that's causing this issue, and how can the offending parts of the iTalk files be removed?
- What do the two choices here even mean? Which am I suppose to pick?