Version:           0.8.5 (using KDE KDE 3.5.5)
Installed from:    Unspecified Linux
OS:                Linux

KGet downloaded 8 files simultaneously.
I selected the latest 7 of them and clicked "pause". KGet crashed.
Unfortunately, I was not able to reproduce it, but here are the debugging symbols:

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Using host libthread_db library "/lib/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1240271120 (LWP 3234)]
[New Thread -1306285168 (LWP 3372)]
[New Thread -1297884272 (LWP 3361)]
[New Thread -1289483376 (LWP 3348)]
[New Thread -1281082480 (LWP 3322)]
[New Thread -1272681584 (LWP 3308)]
[New Thread -1264280688 (LWP 3291)]
[New Thread -1255879792 (LWP 3273)]
[New Thread -1247478896 (LWP 3258)]
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[KCrash handler]
#9  0xb7ccba5b in KIO::Slave::resume () from /opt/kde/lib/libkio.so.4
#10 0xb7ccbccb in KIO::TransferJob::resume () from /opt/kde/lib/libkio.so.4
#11 0xb7d411a0 in KIO::FileCopyJob::slotData () from /opt/kde/lib/libkio.so.4
#12 0xb7d41c13 in KIO::FileCopyJob::qt_invoke () from /opt/kde/lib/libkio.so.4
#13 0xb71ba1e9 in QObject::activate_signal () from /opt/qt/lib/libqt-mt.so.3
#14 0xb7cd755d in KIO::TransferJob::data () from /opt/kde/lib/libkio.so.4
#15 0xb7cd75e8 in KIO::TransferJob::slotData () from /opt/kde/lib/libkio.so.4
#16 0xb7d17129 in KIO::TransferJob::qt_invoke () from /opt/kde/lib/libkio.so.4
#17 0xb71ba1e9 in QObject::activate_signal () from /opt/qt/lib/libqt-mt.so.3
#18 0xb7cd56de in KIO::SlaveInterface::data () from /opt/kde/lib/libkio.so.4
#19 0xb7d424c5 in KIO::SlaveInterface::dispatch ()
   from /opt/kde/lib/libkio.so.4
#20 0xb7d32428 in KIO::SlaveInterface::dispatch ()
   from /opt/kde/lib/libkio.so.4
#21 0xb7ce626b in KIO::Slave::gotInput () from /opt/kde/lib/libkio.so.4
#22 0xb7d33b20 in KIO::Slave::qt_invoke () from /opt/kde/lib/libkio.so.4
#23 0xb71ba1e9 in QObject::activate_signal () from /opt/qt/lib/libqt-mt.so.3
#24 0xb71bacf2 in QObject::activate_signal () from /opt/qt/lib/libqt-mt.so.3
#25 0xb74e30e0 in QSocketNotifier::activated () from /opt/qt/lib/libqt-mt.so.3
#26 0xb71d8060 in QSocketNotifier::event () from /opt/qt/lib/libqt-mt.so.3
#27 0xb715be47 in QApplication::internalNotify ()
   from /opt/qt/lib/libqt-mt.so.3
#28 0xb715cc0f in QApplication::notify () from /opt/qt/lib/libqt-mt.so.3
#29 0xb787a5ce in KApplication::notify () from /opt/kde/lib/libkdecore.so.4
#30 0xb7150e11 in QEventLoop::activateSocketNotifiers ()
   from /opt/qt/lib/libqt-mt.so.3
#31 0xb710b48e in QEventLoop::processEvents () from /opt/qt/lib/libqt-mt.so.3
#32 0xb7172721 in QEventLoop::enterLoop () from /opt/qt/lib/libqt-mt.so.3
#33 0xb71725d6 in QEventLoop::exec () from /opt/qt/lib/libqt-mt.so.3
#34 0xb715baaf in QApplication::exec () from /opt/qt/lib/libqt-mt.so.3
#35 0x080619d8 in ?? ()
#36 0xbfe942d0 in ?? ()
#37 0x00000001 in ?? ()
#38 0x00000001 in ?? ()
#39 0x00000000 in ?? ()