I have a couple of old torrents that I had tried to download that appear broken. I get messages that sharing with others goes beyond the file end and such. I've removed the torrent files I used to download and I've removed the actual downloaded files, but there is still some stuff in .ktorrent, I think, as this problems recurs every time I restart KTorrent. How can I clean out this broken stuff?

For each torrent KT creates a tor<Number> directory in the temporary files location (by default ~/.kde/share/apps/ktorrent)

If you just delete those directories, KT will no longer load the corresponding torrents.

That was very helpful. Thanks so much.