Wasn't using Principled shader before normally diffuse and toon only with blend, just started using a month back. So that could be the hiccup.

CTA5, Iclone 7, 3D Exchange Pro, Character Creator 3, Popcornfx plugin, Zbrush, Blender, Vue 2014, Adobe cc suite, Spriter
Homebuild Workstation (Pretty old now but still working great) Win 10, Intel i7 950, 24 GB RAM DDR3, Gigabyte x58a-ud7 motherboard, AMD R9 390 sapphire 8GB VRAM.
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The principled shader is great, and so easy, you want glass, no problems, set roughness to zero, transmission to 1, walla, you want frosted glass, no problems, just krank up transmission roughness!

Worked on it a bit, made transparency work, sorta, added a sun light, not much really, looks better IMHO, next I will look at strand hair in Eevee, should be interesting!

here is a hair preview in Eevee, hair does not render yet according to a developer, coming soon, but it gives an idea!

Working on a last test, in this one I figured out transparency and few other things looks a lot better this way!
Will render the full animation when I have time, but so far Eevee is promising, could very well become a good tool to replace iClone real-time engine, which is lacking IMHO, not to mention that with Eevee you get all the goodies that comes with Blender!

Not iClone related, but it gives a decent look at how far Blender 2.8 and Eevee are in development, really cool stuff!

Latest test in Eevee importing iClone animation, in this one I fixed the eyes and transparency, took around 1.5 second per frame, which isn't bad considering Blender 2.8 is not even beta yet!

Blender 2.8 will definitely be in my pipeline, along with iClone, now if CC3 could come out!