Board Thread:General Discussion/@comment-86.172.89.47-20150429192922/@comment-26200925-20150501005224

Might be unrelated, but in any case,have Steam verify the integrity of your game cache.

Right-click on Subnautica in Steam --> Properties --> Local Files --> Verify integrity of game cache

Other than that, you can also post on the official forums or ask them on Hipchat (see sidebar on the wiki homepage).