stones

Hi! I just downloaded the game off Steam on my Mac and the game won't let me forage stone. When I use my axe on stone nothing happens. Anyone else experiencing this problem?

Farm map, no mods, was occurring prior to 1.5 update (95% sure at least). One particular square on the bottom edge of the farm map spawns either a small rock or small log every few days. If not mined/chopped, it begins spreading like weeds would, spawning a mixture of rocks and small logs...