Version:            (using KDE KDE 3.5.2)
Installed from:    SuSE RPMs

This has happened to me a couple times, but I can't reliably reproduce it.

Steps to reproduce:

1. Right-click on IMAP folder, select "Properties".
2. Rename the folder.
3. OK
4. Left-click on another IMAP folder.
5. Left-click back on the first IMAP folder.
6. KMail crashes.

Backtrace:

(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1240721728 (LWP 12132)]
[New Thread -1290237008 (LWP 14209)]
[Thread debugging using libthread_db enabled]
[New Thread -1240721728 (LWP 12132)]
[New Thread -1290237008 (LWP 14209)]
[New Thread -1278702672 (LWP 12148)]
[New Thread -1270309968 (LWP 12147)]
[New Thread -1261917264 (LWP 12146)]
[New Thread -1253524560 (LWP 12145)]
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1240721728 (LWP 12132)]
[New Thread -1290237008 (LWP 14209)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#9  0xb6866a60 in clearerr () from /lib/tls/libc.so.6
#10 0xb59f52d6 in KMFolderMbox::addMsg () from /opt/kde3/lib/libkmailprivate.so
#11 0xb59f6579 in KMFolderImap::slotGetMessagesData ()
   from /opt/kde3/lib/libkmailprivate.so
#12 0xb59f6dbd in KMFolderImap::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so
#13 0xb6c7d7de in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#14 0xb77d4c24 in KIO::TransferJob::data () from /opt/kde3/lib/libkio.so.4
#15 0xb77d4f33 in KIO::TransferJob::slotData () from /opt/kde3/lib/libkio.so.4
#16 0xb7805987 in KIO::TransferJob::qt_invoke () from /opt/kde3/lib/libkio.so.4
#17 0xb6c7d7de in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#18 0xb77d52e2 in KIO::SlaveInterface::data () from /opt/kde3/lib/libkio.so.4
#19 0xb77ebc7d in KIO::SlaveInterface::dispatch ()
   from /opt/kde3/lib/libkio.so.4
#20 0xb77c6603 in KIO::SlaveInterface::dispatch ()
   from /opt/kde3/lib/libkio.so.4
#21 0xb77c790b in KIO::Slave::gotInput () from /opt/kde3/lib/libkio.so.4
#22 0xb77ef05a in KIO::Slave::qt_invoke () from /opt/kde3/lib/libkio.so.4
#23 0xb6c7d7de in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#24 0xb6c7de0d in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#25 0xb6fd6b00 in QSocketNotifier::activated ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#26 0xb6c9d1a0 in QSocketNotifier::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#27 0xb6c1a3ff in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#28 0xb6c1bfe3 in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#29 0xb72f0d01 in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#30 0xb6c0e406 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#31 0xb6bc6f75 in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#32 0xb6c32231 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#33 0xb6c32076 in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#34 0xb6c1beaf in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#35 0x08064315 in ?? ()
#36 0xbfea7250 in ?? ()
#37 0x00000001 in ?? ()
#38 0x00000001 in ?? ()
#39 0x00000000 in ?? ()
#40 0x00000000 in ?? ()
#41 0x00000001 in ?? ()
#42 0x08069d20 in typeinfo name for QPtrList<KParts::Part> ()
#43 0x00000000 in ?? ()
#44 0x08068eea in typeinfo name for QPtrList<KParts::Part> ()
#45 0x08069309 in typeinfo name for QPtrList<KParts::Part> ()
#46 0xb7374fdf in KRandomSequence::m_nShuffleTableSize ()
   from /opt/kde3/lib/libkdecore.so.4
#47 0xbfea7258 in ?? ()
#48 0xb7fa5bce in _dl_name_match_p () from /lib/ld-linux.so.2
#49 0xb6821e80 in __libc_start_main () from /lib/tls/libc.so.6
#50 0x08058c01 in ?? ()