Try this, for each material setting on the hair, in the material room, disconnect the texture map from the Diffuse_Color node & connect to the Alternate_Diffuse node instead. Turn the Diffuse_Value to 0 & copy the original Diffuse colour to the Alternate_Diffuse colour.

There was a thread describing this fix at DAZ, I can't find it at present, but I had the info copied to a word file.

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