You have explained everything so well and really helped me. I did all you said and it still does not work. maybe anyone else has a suggestion? Bump mapping works perfectly fine btw...

What I do:
I load the diplacement maps on M4, go to the surface menu, highlight M4 in the tree and play with the dialer fpr displacement, nothing happens. Where it says the file name, it says "Multiple" when all of M4 is highlighted. When I only highlight a specific body part of him in the tree, it say the name of the file for the body part I just chose, like it should be I guess. So it finds all the files it needs I assume as it automatically telly me which one it is using when a body part is chosen.

I see nothing though, even with strongest displacemt chosen. I play with lights and do litle renders to take a look as I assumed maybe it is just not visible in the preview but in the result render.

This is really starting to p*** me off as I spent money for these and I love how they look. Others peoples characters looks so great with these and so much more realistic. I always have to draw the veins in post work which takes some time and is not always easy due to the chosen lighting in the render.

Please, if anyone has any idea or has had the same problem and solved it, help me out.

If this helps, I have DAZ 3.0.