Depending upon the mod(s) you are using you might be able to take the easy option of just copying the eq2ui.xml file accross from the default directory. However unless you are sure that the UI you are using hasn't modified this file, at all, do the following instead.
Edit the eq2ui.xml file in your custom directory by adding the following lines:
<include>eq2ui_commonelements.xml</include>
<include>eq2ui_textstyles.xml</include>
<include>eq2ui_shadowstylesnew.xml</include>
<include>eq2ui_specialelements.xml</include>
<include>eq2ui_windowelements.xml</include>
AFTER the line: <include>eq2ui_gamedata.xml</include>
Also add this line:
<include>eq2ui_arenachampions.xml</include>
AFTER the line: <include>eq2ui_Templates.xml</include>
HTH HAND
