I'm having the exact same problem and honestly, it's making tanking difficult for me. I look at name plates for multiple reasons. One is I see them most of the time before I see mobs, especially around corners. I watch for all of them to be tinged red and know I have aggro on everything and if one of them isn't I click and Hand of Reckoning it, simple. And because if I'm targeted on one thing and I see one dying a lot quicker, I know my group is on a different target and if I don't single target it I will probably loose aggro. The whole red tinge thing helps when a melee grabs aggro, its obvious when a ranged pulls aggro bc the thing is running from you but if a melee grabs one of 5 same modeled mobs it may be impossible to notice (especially since my grid has not been updated and I can just see if someone grabs aggro and one click a Righteous Defense.) I hope they fix this soon bc its making my personal way of tanking difficult, which I don't need since I have the whole new Holy Power system and consolidated attacks to get through.