[Othesus]

I haven't looked at the eXtremeUI but I can tell you that in the default UI the eq2ui_IconStyles.xml file was updated on 11/14/2006 and you're probably missing this part and maybe something else:

        <ImageStyle Filter="true" Loop="false" Name="ability_ready">
            <ImageFrame Source="images/icon_ready.dds" SourceRect="0,0,42,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="42,0,84,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="84,0,126,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="126,0,168,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="168,0,210,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="210,0,252,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="252,0,294,42"/>
            <ImageFrame Source="images/icon_ready.dds" SourceRect="294,0,336,42"/>
        </ImageStyle>

That's an 8 frame animation of the sparkle that appears on the hotkeys.