Hi all, 

As you'll see below, shapekey adjustment is making the wrinkle maps turn black. I've not touched any materials, and I used the import plugin. Any suggestions? 

Is it likely this is something from within CC4 (too many layers) or a Blender setting? 

Thanks in advance!
84% of original size (was 601x742) - Click to enlarge

It's not missing textures because they would turn white.

The pattern of it suggests the problem is in one of the Std_Skin_Head_Wrinkle_DiffuseX.png maps. Maybe it hasn't exported properly?

You could try re-applying the wrinkle maps in CC4, see if that fixes it.

I had a similar problem a few months back with version 2.02 of the plug-in.  Subsequent update corrected the issue, but at the same time I re-exported the character, which also may have helped by saving the textures, re-exporting them to a new folder.  I wonder though, is that character you're importing, is it a DAZ character sent via Transformer?  Because, that's what my character was as well.  Not sure if that might be a factor or not.  Just throwing it out there.  But, again, I re-exported the character with the updated version, I think it was version 2.03 or 2.04, and didn't have the problem again.  Currently using 2.10 and haven't seen a recurrance of the problem with that iteration either.

I think I found the reason! I had too many Normal Maps in CC4 that seem to have been competing with one another. Stripping back (alot were unnecessary which I didn't realise), solved this issue.