dont know, i know one thing : with one texture on the .fbx, no problem, med import it perfectly in the same time of your .fbx.

more than one texture, nothing is imported, i think u have to import it manually with add skin in "edit" but i don't know use it.. i always get sad texture like "2 sided mapping" or "6 sided mapping" or "atlas sided mapping"..

so i only work with 1 texture per .fbx (sucky, i know) and still looking for a solution for perfect-import (like original, not "sided mapping") multi-textures.