You need to re-download all of your .torrent files (for both seeding and leeching), otherwise you will not be connected (due to myspleen site upgrades)... So, if you were leeching something, this is the reason the torrent now appears dead. My projects' torrents are now being seeded again...
Also, it seems as if new registrations are only to be approved through an existing member invite system. No more public registrations...