Blank elements in interface

[Blagden]

I've read and followed the instructions for using the UI Builder. However, I must till be missing something since I am only able to see a black elements for a lot of windows. For instance, I select the Tab on the right side for Interface and can see the graphics for Store and Trade. All the other windows (BuildBank, Bag, Bank, etc...) are all black with red boxes for the elements (as I select each element). What am I messing up?