Imported a Daz Genesis 8 Female character using the Transformer tool (imported textures using advanced mode). As soon as I tick the "activate editor" checkbox under Appearance->Skin, the micro normals disappear on the character. In the materials tab, I can see that Micro Normal mask has been replaced with a warning logo. After exiting SkinGen, the mask is still missing but now it shows black instead of the warning logo. All of the other textures remain intact - only the micro normal mask is affected.

This only happens with Daz imported characters. However, the warning logo shows up on the micro normal mask while in SkinGen for non-Daz CC3 Base+ characters as well. But the micro normals remain visible throughout, and the correct mask returns after exiting Skin Gen for the non-Daz characters.

I noticed that yesterday, but was thinking I was doing something wrong.
It even disappears from the iClone Base Katherine.

Ah, so it's not a Daz/Transformer specific problem then.

I did a little more testing and it's happening with the figures from the CC3 Hivewire Teaser Pack as well. And with the demo project "DH Sample" (which I had to convert from CC3 to CC3+ first). Maybe it happens with all converted figures?

Hope this bug is fixed soon!

Just noticed it's even happening with Headshot characters.
Since this issue isn't specific to Transformer like I originally thought, this thread should probably be moved to the "technical issues" subforum. I've also just submitted an issue to the feedback tracker.