Note that you cannot render if the model is in particle edit mode. Then you just get something looking like a semi-transparent blob. You have to enter object mode before rendering.
Otherwise I don't know what'd cause it. I just saved the blend without doing anything special, and it worked on my side.
For attaching, I suggest not doing that. Instead, do the following:
* Export a MH model as usual, including the mesh hair model you think fit best with the general layout
* Import in blender
* Do a file->append to import the particle hair model into the scene (you can find a "hair" group under groups folder inside the blend when appending)
* On the mesh hair on your own model, do the following:
-- Change default material to "invis"
-- Add a new material and pick the "hair" which should now be available
* On particles tab
-- Create a new particle system
-- Change "type" to hair
-- Change settings from "particle settings" to "hair" (which should be available after having appended the particle hair model)
* Delete the hair mesh you got when appending
You should now have hair looking like a big fur ball. But it should be combable etc. It's attached to the model and will deform with posing etc.
Note that depending on the scale of the model (if you exported from makehuman with "meter" or "decimeter"), you might have to change the velocity of the emission from the normals to adjust the hair length. You have to do this before starting to comb.
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