Sorry to re-post about the same problem--I thought I had solved it, but apparently not...
I had gotten about halfway through exporting a map when feralheart froze up. Not thinking much of it at the time, I stopped the program and restarted it. It's wouldn't even open without showing the error "Feralheart.exe has stopped working..."
I deleted a few of the extra files (objects, mods...) I had downloaded, and I could get into the game and log in, but when I would click to get into the game and the loading screen would come up, it would give me the same error again.
I have tried deleting things, completely emptying out my particles file, and I'm currently in the process of re-downloading/re-installing the program. Any help??