Version:            (using KDE KDE 3.5.6)
Installed from:    Gentoo Packages
Compiler:          gcc-Version 4.1.1 (Gentoo 4.1.1-r3) i686-pc-linux-gnu -march=athlon-xp -pipe -O2
OS:                Linux

There are a few imap folders on a courier-imapd. Mails are fetched by fetchmail and sorted into these folders. They are all created and filled the exactly same way by fetchmail.
In one of the directorys I can't read half of the messages. They are the same after every kmail start, so no random errors. Mostly they are in blue color in the overview. Blue messages never work, black ones sometimes don't. These messages look like others in plain text in the maildir. They also work fine in squirrelmail. When I click them, nothing happens, the message window is empty. When klicking a message a second time (sometimes earlier but not reproduceable) kmail crashes.

Output:
$ WeaverThreadLogger: thread (ID: 2) suspended.
WeaverThreadLogger: thread (ID: 1) suspended.
WeaverThreadLogger: thread (ID: 3) suspended.
WeaverThreadLogger: thread (ID: 4) suspended.
$ pure virtual method called
terminate called without an active exception
*** KMail got signal 6 (Crashing)
KCrash: Application 'kontact' crashing...


Bugtrace:
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)

[last line repeated ... times]

(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1240806720 (LWP 7163)]
[New Thread -1281881200 (LWP 7167)]
[New Thread -1273488496 (LWP 7166)]
[New Thread -1265095792 (LWP 7165)]
[New Thread -1256703088 (LWP 7164)]
[KCrash handler]
#9  0xb7f7a410 in ?? ()
#10 0xbffcd97c in ?? ()
#11 0x00000006 in ?? ()
#12 0x00001bfb in ?? ()
#13 0xb60d8560 in raise () from /lib/libc.so.6
#14 0xb60d9c8e in abort () from /lib/libc.so.6
#15 0xb62bb040 in __gnu_cxx::__verbose_terminate_handler ()
   from /usr/lib/gcc/i686-pc-linux-gnu/4.1.1/libstdc++.so.6
#16 0xb62b8ae5 in std::set_unexpected ()
   from /usr/lib/gcc/i686-pc-linux-gnu/4.1.1/libstdc++.so.6
#17 0xb62b8b22 in std::terminate ()
   from /usr/lib/gcc/i686-pc-linux-gnu/4.1.1/libstdc++.so.6
#18 0xb62b91d5 in __cxa_pure_virtual ()
   from /usr/lib/gcc/i686-pc-linux-gnu/4.1.1/libstdc++.so.6
#19 0xb54929af in KMReaderWin::setMsg ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#20 0xb55e337e in KMMainWidget::slotMsgSelected ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#21 0xb55f3b6b in KMMainWidget::qt_invoke ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#22 0xb6839029 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#23 0xb54400de in KMHeaders::selected ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#24 0xb5442aa7 in KMHeaders::highlightMessage ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#25 0xb5442e8c in KMHeaders::highlightMessage ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#26 0xb5450124 in KMHeaders::qt_invoke ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#27 0xb6839029 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#28 0xb6b7ead1 in QListView::currentChanged ()
   from /usr/qt/3/lib/libqt-mt.so.3
#29 0xb69188f7 in QListView::setCurrentItem ()
   from /usr/qt/3/lib/libqt-mt.so.3
#30 0xb691b81f in QListView::contentsMousePressEventEx ()
   from /usr/qt/3/lib/libqt-mt.so.3
#31 0xb691c1b4 in QListView::contentsMousePressEvent ()
   from /usr/qt/3/lib/libqt-mt.so.3
#32 0xb7137c65 in KListView::contentsMousePressEvent ()
   from /usr/kde/3.5/lib/libkdeui.so.4
#33 0xb5442fc9 in KMHeaders::contentsMousePressEvent ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#34 0xb694d2cf in QScrollView::viewportMousePressEvent ()
   from /usr/qt/3/lib/libqt-mt.so.3
#35 0xb694a809 in QScrollView::eventFilter () from /usr/qt/3/lib/libqt-mt.so.3
#36 0xb69196a6 in QListView::eventFilter () from /usr/qt/3/lib/libqt-mt.so.3
#37 0xb5444649 in KMHeaders::eventFilter ()
   from /usr/kde/3.5/lib/libkmailprivate.so
#38 0xb68388fc in QObject::activate_filters ()
   from /usr/qt/3/lib/libqt-mt.so.3
#39 0xb683896b in QObject::event () from /usr/qt/3/lib/libqt-mt.so.3
#40 0xb6870fdc in QWidget::event () from /usr/qt/3/lib/libqt-mt.so.3
#41 0xb67da4a7 in QApplication::internalNotify ()
   from /usr/qt/3/lib/libqt-mt.so.3
#42 0xb67db1f9 in QApplication::notify () from /usr/qt/3/lib/libqt-mt.so.3
#43 0xb6e326de in KApplication::notify ()
   from /usr/kde/3.5/lib/libkdecore.so.4
#44 0xb677b072 in QETWidget::translateMouseEvent ()
   from /usr/qt/3/lib/libqt-mt.so.3
#45 0xb677a93f in QApplication::x11ProcessEvent ()
   from /usr/qt/3/lib/libqt-mt.so.3
#46 0xb678a98a in QEventLoop::processEvents ()
   from /usr/qt/3/lib/libqt-mt.so.3
#47 0xb67f0ba0 in QEventLoop::enterLoop () from /usr/qt/3/lib/libqt-mt.so.3
#48 0xb67f0a26 in QEventLoop::exec () from /usr/qt/3/lib/libqt-mt.so.3
#49 0xb67d9f3f in QApplication::exec () from /usr/qt/3/lib/libqt-mt.so.3
#50 0x08058e9c in ?? ()
#51 0xbffce998 in ?? ()
#52 0x00000001 in ?? ()
#53 0x00000001 in ?? ()
#54 0x00000000 in ?? ()

Maybe you'd like to see one mail causing a crash. I don't want to post personal mail so please excuse posting a spam mail...

$ cat 1171100048.30853_0.mauer\:2\,
X-Apparently-To: [filtered] via 217.146.177.226; Sun, 04 Feb 2007 18:42:06 -0800
X-YahooFilteredBulk: 213.37.112.111
X-Originating-IP: [213.37.112.111]
Authentication-Results: mta236.mail.re3.yahoo.com  from=cajunmusic.com; domainkeys=neutral (no sig)
Received: from pop1.mail.vip.ukl.yahoo.com [217.12.10.100]
        by mauer with POP3 (fetchmail-6.3.6)
        for <[filtered]@localhost> (single-drop); Sat, 10 Feb 2007 10:34:08 +0100 (CET)
Received: from 213.37.112.111  (HELO cajunmusic.com) (213.37.112.111)
  by mta236.mail.re3.yahoo.com with SMTP; Sun, 04 Feb 2007 18:42:06 -0800
Message-ID: <01c748cf$4bfc13f0$6f7025d5@jacasque7ba1d1>
Reply-To: "Mariabella Wakeland" <mceacelv@cajunmusic.com>
From: "Mariabella Wakeland" <mceacelv@cajunmusic.com>
To: "Jaak Stanley" <[filtered]>
Subject: Re: new buil
Date: Mon, 5 Feb 2007 03:42:37 +0100
MIME-Version: 1.0
Content-Type: text/plain;
        charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2800.1106
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106

Hi,

Vinagra - 3. 35
Vanlium - 1. 25
Cinalis - 3. 75
Amnbien - 2. 90

http://lodrx!com

Important, Replace "!" with "."

--

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Fighting the Dark Arts,  said Fred.
Hes seen it all,  said George.