I took this from the US Forums. Hello Blizzard please fix the stuff you just broke!
“Pretty well explained in the title, I dont use addons and really really prefer to not use any. Before the 10.1.5 patch I was able to see what targets had glimmer of light on their nameplates, since the update I can no longer see what targets have glimmer of light without clicking on the target and checking their buffs and debuffs.”