I have 5.5 fully updated iclone
. My problem is when I try to change his clothes by clicking
Diffusion window to launch mat library. The library shows empty.
However if I go into library manually all contents are visible
And will load by click and drag method. Any ideas what
Is happening?

You don't launch the materials library by clicking the Diffuse channel. Clicking the Diffuse channel allows you to select a picture or video to use in the texture.

Look just above the Diffuse channel, and you will see the Load Material button. That should get you where you want to be.

You have to click "Load Material". An Explorer window with the Materials Lib folder will then open. From there you can navigate to the desired material.

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apologies in delay for reply. yeah thanks understand now cheers