Okay, to get the original Feral Heart, go to the downloads page, up above this. And download the setup that's near the top, the original. This will fix the black screen. Save it as FeralHeart (should be the automatic save file). Once you have this, log on to your character and get to the Cape of Distant Worlds. Then exit off.
Go back to Feral Heart + and access that same character, and you should be good to go.
The problem with Feral Heart + is that the default home for the original does not exist in +. Therefore you have to move it to a map both games share; ie Cape, Bonfire, Ficho; and then switch over.