Like everyone has said we have all seen it before.
I think that I had it at one stage or something similar but not sure.
I know mark had it because I have seen it in some of his movies.
How it happens & how to fix it I don't know???
I have managed to re-create it.
First I'll grab the picture then under that I will explain how it pappened........

In the first pic I opened a hair haptar.
The second pic is the hair skin.
The 3rd pic is what hapens when you drop a skin on the hair.
There are so many things that can up-set our computers.
Have you got any new programs,hardware etc.
Have you tried to alter the hairs in some way.
Last resort is that windows has got a little problem.
The thing is DON'T give up.