Oh dang! I'll look into that right away!

Could you share with me your specs as well as what resolution you were trying to set it too?

In the mean time, try deleting your save file at
C:\Users\USER\AppData\LocalLow\CardboardKeep\WitchThief\[SteamIDNumber]

The file will look like this
SavedGames.WTsave

Deleting this file should encourage the game to clear your settings

Already tried it and it doesnt help for some reason. I assumed broken config file was saved in cloud so turned off internet, but that didnt help too.
This thing helped:
"Right-click on the game title under the Library in Steam and select Properties.
Under the General tab click the Set launch options... button
Write:
-screen-width 1920 -screen-height 1080
where 1920 and 1080 can be changed as you wish"

So i have win7, core i5-7600, gtx 1060, video driver 399.07 and i use 1920x1080 resolution.
But the game had that resolution by default. The reason i pressed "apply resolution" is because fps slider doesnt change anything if you press "apply graphics".

Interesting! I'll fiddle around and see if I can repro. The FPS slider may only influence the actual in game FPS and not the menu FPS.

Thanks for the stats and your patience on the issue

FPS slider doesnt change anything for me. Cant get more or less then 60 fps.
P.S. It seems like i cant change any graphical option

Hmmm, maybe it is related to Win7? I will look into it!

I just had the same problem happen to me aswell, fortunetly the solourtion provided above helped me.
Cheers guys!

Great! Sorry it occurred, but this should help me isolate the issue (as it wasn't a freak occurance)

Good news friends, I have reproduced this issue on my end, and am applying fixes and testing for it now. I hope to have a patch for this out soon!