Apparently I included an older threat meter from Test that was missing elements to support the more recently separated Implied target DynamicData.
Simply delete the eq2ui_mainhud_threat.xml file from your FetishNightfall directory and the default should load.
I expect to have a patch or new release out in a day or two. It will include a skinned version of the threat meter with AutoAttack timers incorporated
Should also resolve a bug with the Inventory "Head" button and update the Hotbar Options window. Hopefully I'll have time to finish the ClickRecast feature.