Hello.
The issue started a couple days ago, whenever i alt tab, the colors flicker (go to orange then blue then back to normal) for half a second. Only FFXIV is affected, desktop and other programs remains unchanged.
It happen only when the game is on DX11, fullscreen or borderless, no others game are affected by this issue.
This is what i've tried so far

-Config to min then standard then max
-Reset config
-Redownloading the game
-Check DXDriver
-Reinstall GPU driver

my config if it can help:
•CPU: i5-4670k
•GPU: AMD Radeon 7950 HD 3Gb sapphire
•Motherboard: MSI Z87-G43
•OS: Windows 10