While there may be a bug in the 3 values being the same, which is that if R=G=B=0 then do nothing this continues as if R=G=B then there is no purpose in that what you get is white light below the surface so does not change the color. The work around is the make each value almost but not quite the same. So R= 2.50, G=2.499 and B=2.501 that would get you to almost the same distance inside the skin and then scatter.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13