Just like to mention this is happening to me too - tried all the above steps tweaking brightness and exposure to no avail
Summary:
How to Reproduce: Go into one of the menus: Character, Inventory, Party, Clan
Version: e1.1.0 Beta
Computer Specs:
OS: Windows 10 64-bit
GPU: Nvidia GTX960 4GB
CPU: Intel i7-4790 @ 3.60GHz
RAM: 16GB
Storage Device (HDD/SSD): HDD