Summary:
I start Stonehearth.
I click on either singleplayer, continue or mods but nothing happens.
When I click on multyplayer only the window with “how many players” appears but nothing happens after that.
When I click on loead game, the loead game menu opens but I can not load a game.
Having same problems, renaming building_templates didn’t work.
If its been a long time since you’ve played, and installed mods in the past, go into your mods folder, delete everything, then validate the game files. This will bring back everything the game needs. That’s what ended up working for me.