invisible loot tags

For the past week on occasion, the loot drops do not show tags they are there. I have to move the mouse around to search for or look for loot. Does not happen on all characters. Right now just on 2 of the 6. Not sure if this auto corrects itself or just a bug. I just now got in the habit of doing mouse sweeps after i kill a mob. Luckily Im only on act 2 and not doing massive clears like maps.

Press the Z key.