the new update broke the game for me too, when i click on login i get a black screen and i cant even close the game, everything else is working fine in background, i can alt tab, open the task manager etc, but the game wont close and i have to restart my pc.
my specs are:
i5 3570k@4.2ghz
16gb ram
gtx 980 ti with latest driver 361.91
windows 10 64bit pro