I can't remember the exact place to set this because I'm at work, but this can be fixed in the Render Options panel. I think it's Render Settings>Preview tab, change it from OpenGL mode to Sree(spelling?) mode. That fixed it for me... I was sick of Vicky's teeth jumping out of her head towards me! Karen :-)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire