Now, I'm not good at modeling pants (because I always fight that area as well), but I would remove the two rows of polygons on the inner thighs, so that the Hip is only a very very narrow row of pixels between the legs.

I'm not sure if it would fix it, but it's worth a try at least :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.