If the files don't appear when you export them, I'd recommend reinstalling.
Find your FeralHeart folder and rename it to anything except "FeralHeart."
Go to your downloads and launch the FeralHeart installer. (FHSetup.exe)
Install FeralHeart and it should make a new FeralHeart folder in your C: drive.
Take the map from your old FeralHeart and move it to the newly installed one.
Load the map, export, and see if it works now.