I've actually been having trouble downloading, or even listening to anything on the site for the last couple of weeks. It just started out of the blue one day while I was listening to ponyvillelive.com, found another song I liked, and clicked the pony.fm link for it. Suddenly I'm getting messages like "Failed to load track" and "500 Buckets of oats on the wall".
Same as you, I tried emailing Logic multiple times, but the email is apparently unavailable, and I just recently reached out to the MLP Forums about the issue. Hopefully someone can resolve this soon.