Version:           2.0.3 (using KDE KDE 3.5.5)
Installed from:    Debian stable Packages
OS:                Linux

The only thing I noticed is that I can't predict when it will crash.  For example I looked at:
one task versus lots of tasks
Ktorrent running in the system tray versus active in an open window
Sometimes it will run for hours and sometimes it will crash in five minutes.

Oprating system is Etch Stable.

When launched from a terminal the exit error message is:
QGArray::at: Absolute index 0 out of range 
Crash: Application 'ktorrent' crashing...

The crash handler reports: 

The application KTorrent (ktorrent) crashed and caused signal 11. (SIGSEGV)


Backtrace:
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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1233549632 (LWP 6570)]
[New Thread -1248855120 (LWP 6632)]
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[KCrash handler]
#9  0xb7f388ab in dht::ParseRsp () from /usr/lib/libktorrent.so.0
#10 0xb7f39772 in dht::MakeRPCMsg () from /usr/lib/libktorrent.so.0
#11 0xb7f3986f in dht::RPCServer::readPacket () from /usr/lib/libktorrent.so.0
#12 0xb7f39bd2 in dht::RPCServer::qt_invoke () from /usr/lib/libktorrent.so.0
#13 0xb6fdbd4f in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#14 0xb6fdc7e0 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0xb775164c in KNetwork::KClientSocketBase::readyRead ()
   from /usr/lib/libkdecore.so.4
#16 0xb7751686 in KNetwork::KClientSocketBase::slotReadActivity ()
   from /usr/lib/libkdecore.so.4
#17 0xb77647d5 in KNetwork::KClientSocketBase::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#18 0xb7764874 in KNetwork::KDatagramSocket::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#19 0xb6fdbd4f in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#20 0xb6fdc656 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#21 0xb7365c7b in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#22 0xb6ffe4fa in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#23 0xb6f73c26 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#24 0xb6f75a43 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#25 0xb7725e0e in KApplication::notify () from /usr/lib/libkdecore.so.4
#26 0xb6f07421 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#27 0xb6f65fd9 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#28 0xb6f1b754 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#29 0xb6f8e179 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#30 0xb6f8df9a in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#31 0xb6f757bf in QApplication::exec () from /usr/lib/libqt-mt.so.3
#32 0x08065d4b in ?? ()
#33 0xb67ddea8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#34 0x0805e2b1 in ?? ()