I've been playing with the native poser import today, and it seems that the trans map doesn't always get picked up. Make sure that you have the shader for the eyebrows selected. You may have to select the items in the left column one-by-one (click on or near the "shader spheres") until you get the right shader in the tree (when your at the top level of the individual shader, the shader name will show in the upper part of the right side of the shader editor). Once you get the right shader selected, expand it to show all the levels, if transparency isn't set to texture map, you'll have to manually edit it. When you manually add a poser transmap you need to click the invert texture check box or your trans map won't work properly.

Hope this helps!

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