NovaCalypso
Don't worry. We're aware of it!
As just a moderator myself, I'm not too sure on the technical details of this matter, but I believe it was Music.163 who may have changed something with their site that made it no longer compatible with ours. If I remember correctly, it happened once before.
It will be looked into, in the meantime all I can really suggest is xiami.com (similar to music.163), or uploading your own mp3s to song upload sites, as well as the youtube conversion sites.