Ok i fixed it. I was in Skins>Frames>Heal Group. There i just changed the used Skin from "Standard" to some others, so Group, Raid 10, etc. and suddenly it appeared after changing back to "Standard". Chaning the priorities of the unit frames and putting me just in heal group etc. did not work. It was just chaning skin. You have any idea what this is? On PTR its the same.