napredator: Sorry for telling you to use something bugged without checking but its fixed now. You can use [color:aggro] and everything that comes after it will be colored in this color until there is another color tag in there.
Dynat: Health works like this: You can always see the excact value of everyone thats in your party. Everyone else always shows percentage of health. Mana is always shown as excact value.
When you install Mobinfo2 it uses its database to shown health values for known enemies and calculates them if it doesn't know them already. MobHealth3 ( which Luna uses does always wipe its memory after you restart the client and has to caculate the health again. (You can switch that in its options if you want) Also you can customize how much life has to be lost in order to show values (default 10%).
Reference: http://wow.curseforge.com/addons/project-2615/
dj33mi: I couldn't reproduce that neither with a fresh install or my old config. What did you change after your fresh install to get this error?
Hogbobson: There is an option "Highlight debuffed units you can dispel" under General Settings. With that the black background should change color when someone has a debuff you can cure. Nevertheless i made some improvements to detect if you can actually interact with your target.
Momoh: Blizzard frames should be hidden by default. But i saw on some stream that party buffs popped back up for that guy. It is definetly some other addon that modifies the blizzard frames. Something like ct_mod i guess???