1. If you select smooth health update sometimes you can face a bug when enemy has full hp, however nameplates shows as it has some health missing. See screenshot http://imgur.com/i4EZ53q
   Monk in my target is at full hp, but nameplates has black square as it is damaged.

While was setting my nameplates in suramar had some mobs that were shown as they have ~20% hp even they were full. Set to none, looks like this problems is gone.

2. Another bug is when you are in suramar and put the mask on, so the enemy becomes neutral the bar height is not updated right away, you need to get them out of vision in order to make neutral health bar thin.

I have this bug but constantly. I mean no healthbar text updates ever, neither in smooth mode, neither in cutoff, neither in none. I set the texts to current instead of Max and still the health text always shows the max value.