There is nothing that I can say from top of my head on this, we do have HD4000 around and I've never ever seen this issue.
Thus I believe I might request some help from your side. This will be about 30-40 minutes of remote access session where I will install a debug tool on your machine and analyse its output. Keep me posted in this topic. Of course your privacy is our top priority, so if you can't organise remote access we will have to think about other approaches.
P.S. What about menu screen and character selection screen?
Any differences with everything set to Low?
Windowed mode - 800x600?
Last edited by Stauff1138; 04/07/14 10:50 PM.