Okay, I think I figured out what's going on: Gary, you used a hair, probably the HMann-FmBlondie hair from the library, which consists of a transmapped hair mesh and some dynamic hair on top of this mesh. So, when you exported the hair, you probably exported it as an .obj file, and the transmapped hair mesh got transferred fine, but the dynamic hair didn't. If you want to use that hair in your scene, you can load the transparency map for it inside trueSpace (go to the Textures folder, then Props, then hmann textures if I remember correctly).

I found that if I export the hair as a .3ds file, the results will be different: the .3ds file will include a mesh for the dynamic hair part, but it will not be thin strands; it will be made out of thicker pieces. In the attached picture the hair on the left is a .3ds file imported into trueSpace, and the hair on the right is the .obj file (from the back, so you can see that it seems like it's the same hair that you used). In the .3ds object, I painted the transmapped hair plain yellow and the dynamic hair pieces plain brown, so you can see the different parts.

In a way this might actually be useful: I guess one could export the dynamic hair as a .3ds file, then make a texture and transparency map for it and use it as a transmapped hair in other programs.