This just happened to me also. I was doing my master quest and crashed. Tried to login and now suck at a black screen. New problem every day but oh well
I was doing the same thing. I was in the middle of combat when I froze mid attack like when you use a broken HTB skill, but everything around me froze too. Closed the whole thing down and black screen was all that awaited me. Hope this gets fixed by the time I wake up tomorrow.