Hello,
I am having a weird problem which I could not find referenced anywhere in the forums. I have a 1920x1080 monitor but have the game set to full screen 2715x1527 resolution using NVIDIA's DSR mode to get a better image quality. The game plays fine in this resolution, but every time I relaunch the game it sets the resolution back to 1920x1080 and I have to set it again. After exiting the game I have checked the UserSettings.txt file and the resolution is showing 2715x1527 there.
I had taken a break from the game since December so I am not sure if this started with 1.6 or an earlier version but this definitely worked back in December.