I tried trading with someone today. While everything appears in my inventory on Steam profile - 13 pages, I only had 8 pages in the trade window. Most of my gear, unbound accessories, and unbound materials weren't visible, nor was my crystal energy. I couldn't search for those items either. Pretty much just my crowns, two scattered rows of equipment & a gigantic pile of lockboxes.
(I have over 100 lockboxes - but also over 50 materials & 50 accessories)
Steam released an update that shows how this happened:
All materials (which are tradeable ingame) are marked as Untradeable
All accessories (almost all are tradeable) are marked as Untradeable
And my crystal energy is in an "Unclaimed" portion of my SK inventory instead of being assigned to a character like it used to be appear.