Mesh is black when applying surface noises to model then importing in Zbrush

charlsf3

same mesh made in 3dcoat with and without noise modifier (in surface mode), after I import in Zbrush the one without noise works fine, the one with noise is all black, any solution
no image to post since its essentially a pitch black mesh

charlsf3

I suspect shadows, since its micronoise on high poly surface, maybe it makes tiny little shadows that makes it completely black in zbrush viewport