12 days ago - AndrewT - Direct link
What I'd suggest is a full clean reinstall of the game:

- move any valued save games elsewhere; they are under
C:\Users\{UserName}\AppData\Roaming\Surviving Mars\{large number}\
- "uninstall" in Steam-Surviving Mars
- unsubscribe from ALL mods in the Steam Workshop for this game
- manually delete both the Steam/SteamApps/common/Surviving Mars AND C:\Users\{Username}\AppData\Roaming\Surviving Mars\ folders
- re-install game in Steam, run a Steam Verify when done.
- add MarsSteam.exe to the exceptions list/whitelist of your antivirus app
- start the game with no mods active and test

In particular you need to make sure there are no files or folders left under either the Steam SM or AppData SM locations, before installing again.

Good luck with that!