Hey N810, you're right. The bark textures were missing from several trees. How I didn't notice serves to show yet another cognitive disorder on my part... Thanks. Had to dig to find an answer as the set-up appeared to be ok: something to do with my byzantine file mangement mostly. Here's a re-render.
Thanks Oshyan, I always appreciate your comments. I am truly looking forward to TG's continued evolution in the FBX/Alembic area, be great include so many varied effects into TG!
Dune: Nice tip, and thanks again!