I've been finding lately that when I pose V4 her lower jaw does funny things like sticking out from the chin. If I move it from where it sticks out and then zero out the dial, the lower jaw disappears or goes back to where it belongs. If I don't do anything, it will show up on a finished rendered image. Is there something to keep it from happening? If I make the lower jaw "invisible" V4 can't smile :) 

 That was a problem with the first version of V4 IIRC. Which V4 do you have?  4? 4.1? 4.2?

I am using 4.2 and I went back after posting and did my usual trick of just moving the lower jaw and zero back the dials and it would put the jaw back where it should be, but this time it didn't work. So I unchecked the "visible" for the time being. Kind of annoying to see the red bottom jaw and teeth poking thru the lower part of the face when I start moving the head around while posing.

V 4.2  definitely has mouth parts prob.s
I got mine only a few months ago  and her mouth parts  r  F***ked.

I gave up on her.

save the scene, close it, reopen the scene,  mouth parts should be back in place.

until some time in the near future ..............

It's a known problem of V4 ;it mainly occurs after you've used "point at.." feature for her eyes . Just select her jaw then go to menu toolbar edit - restore - element , it should be fine .

Cheers,
Alizea

Awesome! Thanks for the tip!