I'm the friend Leppa's referring to. Thanks for making the thread.
When I did the uninstall the third time, I deleted the FeralHeart folder afterwards. I still get the same problem. About 10 minutes ago I also tried to do the fix suggested in the video. I'm not sure the problem is explained well enough.
My problem isn't a black screen on startup. I can open the program just fine. Put in my username and password. I've already made the character I want. I've seen in one of the videos that the.. I suppose it's the character select screen? That it's supposed to have an actual background. Mine however has a black background. I thought that was just the nature of the game, but then after I click start, the background is still black. I can't see where I'm going, or even if there is anywhere to go.