Are you loading the GraceLionHair.hr2, or the GraceLionHairP5.hr2?

Does it show okay in the preview window, or is it solid white in there?

Have you had a look at the hair in the material room? Can you give us a screenshot of the material settings for the hair?

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