Try to reinstall the game or the DirectX. I am a very old player, and I know about such issues. In this games such bugs appear regularly, and the only thing that actually helps is reinstalling of the entire game or of the DirectX. By the way, did you notice how difficult is this became? I am already getting bored of doing same actions - quests, farm, raids. Again and again. I am not a child anymore, and I don't have so much time to waste. This is why I started to use a booster wow classic. This thing saves a lot of my time. Now I can skip the not interesting part, and to play only on high levels, which is much more interesting.
