Windowed Fullscreen no longer works after recent patch.

There have been a lot of recent patches lately so I can't say specifically which one it was, but as of a couple weeks ago I could switch between the Fullscreen and Windowed Fullscreen display options, however now it will only run in Fullscreen and the client crashes every time I attempt to switch to Windowed Fullscreen. This happens regardless of whether I try to change the option in the initial menu before logging in or in-game.

System Specs:

Intel i5-6600K @ 3.50Ghz
NVIDIA GeForce GTX 1060 6GB
Western Digital SSD
16GB Installed Ram
Windows 10 Pro

Same here, after waiting for it to reset after 15 or 20 sec and retrying several times it eventually works. But any interaction in between will cause it to go "not responding".