I'm having this issue as well.I try and start the client but then once i log in with my pass it trys to load and the it gives me this "D3D Device Creation Failed D2005530516".I did just update my nvidia drivers but I dont know if that is the cause.
Just after the patch bro.Its still happening,i have not been able to log in for 5 days now.Everytime it loads i get a D3D error.I did just install a new Nvidia driver.