Could you upload your stonehearth.log? It should be inside C:\Program Files (x86)\Steam\steamapps\common\Stonehearth
Black screen usually means some other application is messing with the game (or with the UI process), but if you checked the list from Crashing on start? Read this! UPDATED October 18, 2016 I’m not sure what else could be causing it.
If you change "force_32_bit" : false to "force_32_bit" : true in your user_settings.json does it help?