I've never come across this problem before, but I was wondering, are your map files showing up at all?
If you go into Feralheart > media > terrains >fhmaps , are the .fhm files showing up there?
If they are, then I'd suggest maybe try re-downloading the game in a different way to what you usually do it. As I said, I've never come across this issue in the past, and I'm not a big map person, but that's just from my basic knowledge. I hope you can solve it soon :c