I'm not sure what's up ... it's crashing as soon as I run it now. This might be due to data corruption in a previous crash, or a recent upgrade.

(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1208740144 (LWP 6888)]
[KCrash handler]
#6 0x0022902a in kt::Plugin::~Plugin$base ()
from /usr/lib/libktorrent-2.2.5.so
#7 0x003eeeea in kt::ZeroConfPlugin::~ZeroConfPlugin$delete ()
from /usr/lib/kde3/ktzeroconfplugin.so
#8 0x0017166f in kt::PluginManager::loadPluginList ()
from /usr/lib/libktorrent-2.2.5.so
#9 0x08079ed9 in KTorrentCore::loadPlugins ()
#10 0x08071c5e in KTorrent::KTorrent ()
#11 0x080746b1 in KTorrentApp::newInstance ()
#12 0x02ffc4b4 in KUniqueApplication::processDelayed ()
from /usr/lib/libkdecore.so.4
#13 0x02ffc608 in KUniqueApplication::qt_invoke ()
from /usr/lib/libkdecore.so.4
#14 0x080740af in KTorrentApp::qt_invoke ()
#15 0x022b316a in QObject::activate_signal ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#16 0x0264085e in QSignal::signal () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#17 0x022d1727 in QSignal::activate () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#18 0x022da373 in QSingleShotTimer::event ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#19 0x02249cab in QApplication::internalNotify ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#20 0x0224b129 in QApplication::notify ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#21 0x02f5b921 in KApplication::notify () from /usr/lib/libkdecore.so.4
#22 0x0223da32 in QEventLoop::activateTimers ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#23 0x021f199f in QEventLoop::processEvents ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#24 0x02263250 in QEventLoop::enterLoop ()
from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#25 0x02263116 in QEventLoop::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#26 0x022497bf in QApplication::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#27 0x0808c5af in main ()

I can't reproduce this, the plugin loads fine here. Maybe you reinstall KT to rule out any corrupted stuff.