We recently hit a bit of pain migrating the LDAP database, and lost a few accounts. No user data was lost, just the entries in the group and password tables. I've attempted to reconstruct them as best I can, but there's still a few missing, either because they were not in any project groups before the migration, or because I can't find a GPG key for the account anywhere.
You'll know if this affects you because you won't be able to log in. If this is you, hunt me down on IRC and we can fix things up.
- ajax