This feature has not worked properly for me since 3.1. Even with the 'Enable Highlights' option checked under the 'Auras' tab of any of the frames (Player, Party, Focus, etc.) there is still no actual highlighting of the frame when debuffed. I've tried using r705, r707 and r708, but debuff highlighting has not worked on any of these revisions. Does anyone know why this isn't working or what I need to do to restore it?