Transmission

Yeah, that was a typo on my part, I meant to say 1.20, which I'd just downloaded and installed over 1.0, because auto-update apparently broke somewhere in there.

Anyhow, more to the point, it was a dirty disk. Single user mode and fsck fixed it, apparently.

Seeing a similar problem with 1.10 on 10.5.2. Running a check of local data, will run DiskUtil and see if that helps.