I don’t know. Follow the typical steps, check for latest graphic drivers in your manufacturer’s website (I think someone had to update them again for this release), delete the Stonehearth folder and reinstall from Steam…
And we’ll page @not_owen_wilson in case he can suggest something else. 
Here’s the related thread:
Edit: This is the relevant answer: [Ack] Game doesen't load (black screen) - #16 by not_owen_wilson