Feral Heart

So, I have a Mac computer, and i just recently downloaded Feral Heart using the tutorial on the forums. The problem is, whenever I open FH, it just shows a black screen and crashes. I've tried tons of stuff like closing all my open tabs/other things to make sure it wasn't just lagging, turning my computer on and off (that's the main host of problems), logging in and out of my computer account, uninstalling everything and re-installing it while paying more attention to the instructions, and checking FH's file for any copies of stuff floating around and messing the server up. But nothing. Help?