The problem, as you seem to have discovered, lies in the Inventory window.
It is beyond my skill to fix, but rather than reloading a complete UI, all one needs to do is update the animations and template file, and rename/delete the inventory window.
The two files I have already updated here:
3) Copy into Custom UI folder replacing the older ones
4) Rename or delete the file named "EQUI_Inventory.xml"
5) load your UI
I already messaged DI that the inventory window was at fault so hopefully they will have a fix soon.
-Beimeith, Township Rebellion, Luclin