Reported by Diego R. Brogna I think that the latest version of ktorrent fixes it, but I can't check it until the weekend. Help appreciated.
so far, this seems to affect 2.1 beta1 only (not stable). 2.1rc1 fixes it. KDE, please provide fixed ebuilds once you've some spare time. thanks
ktorrent-2.1_beta1 removed, ktorrent-2.1_rc1 added. Closing on DerCorny's behalf.