Hmm one thing I noticed. When I stick your market window in my DEV folder and open it in UI Builder, everything thats normally after the inventory in the directory tree is now embedded WITHIN inventory.
ie: Normal (without your XML files in directory)::
ROOT
|___NewCharScene
|___Inventory
|___Global
|___Popup
With your XML in the folder:
ROOT
|___NewCharScene
|___Inventory|___Global
|___Popup
This is a problem. I looked at the scripting on your files, and it doesnt SEEM like they have the <includes> in there (that should be in eq2ui.xml) so i dont know exactly whats going on.