It's computer lag related to your graphic card not being able to keep up.  Right click in your working window and see what you have active IE: SreeD or OpenGL.  Try changing to SreeD.

I have that problem with my current graphic card (which is onboard vs stand alone), and it can't run OpenGL, so in PoserPro2010, Vicky's teeth are always floating out front or poking through her mouth.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi