that is for modui, whereas this is kuurtzen's enemyFrames — which features many of the same overall tools as we were often co-developing in nostalrius 1.0.
assuming this uses the same function as i do w/ modui, if you have a target and new nameplates they won't update to show class information until you drop your current target. this is because the limits of vanilla mean class information can't be picked up without cycling through units close to you to target them, gathering the relative info, and then dropping it again very quickly. this action is stopped when you select a target, otherwise guys like rogues and druids would be VERY VERY mad when their combo points are constantly dropped as their target invisibly changes.
just one of the pleasures of working with vanilla code