Black textures, why?

[Baneador]

hi, i have one problem, when i atualized my wow to wotlk some textures become black, and never return to the normality, repair and reinstall wow dont work.

Example: hair of nerubians visirs and udnead nerubians, ears of squirrels, and feathers of neck of the plainstriders.

Someone can helpme? how i can repair this?

Thanks