Ok, so I installed latest version, then few old ones from the archive, updated video drivers, disabled Steam overlay, downloaded old DirectX libraries, tried full-screen, windowed, but it's always the same result:
1) No water in main menu, sometimes clouds move laggy, sometimes not (depends on the Reshade version)
2) No mouse cursor. If I open tutorial - I can see the system cursor (not the game's) stuck in the middle of the screen, twitching. I can navigate Reshade with keyboard, but only partially.
Reshade says it loaded successfully, only version 3.1.1 gave me message that some shaders failed compiling, but the problem persists with every version I tried (some too old ones like 3.0.6 I could not download effects, so I couldn't try them).
There is a strange thing, through. I downloaded Reshade preset by Geoman88 called True Ocean. It required simply to copy files to Subnautica folder. It was the only preset that worked. If I try to install Reshade standard way - no.
Not even sure what to blame.
imgur.com/3vlmRa4