If you are having trouble with hair not doing collisions in legacy double check that no strands are intersecting the figure. I know some of the dynamic hair that came with poser had this problem (at least I think it came with poser. I've had some of  this stuff so long I don't remember)You also may need to check using the show populated checked. I recommend only having one group checked at a time. It can over whelm your machine otherwise.

Cage, try checking your shader try reducing the root or not using any at all.

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I use Poser 13 and win 10