Agro on Target

[Stalker0096]

Hello there

I have enabled "show agro percentages" in the display interface, but If I have agro on something, I am used their Hp frame Glowing a bright Red.
Yet on this server it... doesn't? Have I not enabled something?
I've looked at everything on the interface but cant seem to show... Agro,

[gregbr]

nevermore...