I only get the top left 25% to display the game and the rest of the screen is blank in windowed mode. When in full screen I can get 100% of it IF i am not in 4k resolution. On my 1440p monitor there are no limitations.
I would like to add this was on all screens. Patchnotes, Server select, Character select and in game. I could not see the enter world button, but I could still click it if I found where it usually is.
The game never properly worked in 4k with DX9. Things were stretched horribly unless you used a viewport, defeating the purpose, and particle effects were detached from their origin. Try a viewport setting to see if that makes a difference.
