I'm seeing KTorrent max out one of my CPUs. This appears to be related to one particular torrent even if not running (ie. import the torrent and it spins a CPU, pause it and it still spins the CPU. Only removing the torrent gets KTorrent to behave itself again). I can PM someone the problematic torrent.

This has been fixed (see http://ktorrent.org/forum/viewtopic.php?t=2655)

Oops! I guess I missed that thread. My bad.

On the bright side, it's already fixed... what spectacular service!