in game if you do a /loadui is it listed? If not you have it in the wrong place or you don't have a eq2ui_skin.xml file included.
from the way I take it you directorys look like this ?
Code:
\testserver
| |
| \UI
| | |
| | \testui
| | | |
| | | \images
| | |
| | |eq2ui.xml
| | |<other ui files>
is that correct?