Hmmmmmm...
And you downloaded the version from here?
http://www.eq2interface.com/download...fo.php?id=3470
One thing I can think of, you will need to make an "images" folder in your custom UI folder and move the player_parts.dds into your custom UI's "images" folder, because anything the game does not find in the Custom UI folder it will look in the Default folder, if that file is not in the Default UI folder either, it will most likely appear blank.
So creating an "images" folder ini your custom UI folder and adding the file to that folder or just moving the file to your already created "images" folder in your Custom UI folder may fix the isssue.