Are you using Peerguardian? I believe one part of it actually has this site on its blacklist. That in itself puts a bit of a question mark over Peerguardian don't you think. Not sure what their motivation for doing so is. I saw on their website peerguardian itself was temporarily put on a blacklist, perhaps due to their own inconsistencies (and behaviour.) They appear to be anti p2p in more ways than one.