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