I'm still struggling with the "braids" part on anyone's hair as well but found some workable 'work arounds' for it..
The steps recommended by wimvdb are valid yet I don't see the nodes that he refers to in Poser to apply his fix so had to come up with something that would work for me..
I think this works 90% of the times I use braids so hopefully some of this might help you
There are two hair shaders by RedSpecc, I typically use the RedSpec_TGX_Hair_Poser one instead of the RedSpec_TGX_Hair_Poser_auto-displacement_beta file as I find that last one results in very detailed hair that takes much longer to render..
Attached image shows (LEFT) what I end up with the problem braid issue.. SO, to fix that, I reconvert material from Poser, and then apply the RedSpec_TGX_Hair_Poser_auto-displacement_beta file to ONLY the hair material that is causing the problem, in this case, 107M4.. but it leaves the hair not quite right up close.. you can see through too much of it still...
So in the end, I "Copy mix material node" from the head piece and then PASTE the mixed material node to the 107M4 using the copied imagemap.. and the braids on the far right image is what I end up with.. i think it looks right?
I would still like to know how to get this to work properly though.. I had recently purchased someone else's braided hair and it did the same thing, even though it was the first time seen on my system.. ?
Anyway, I do hope some of this helps.. ?