Version:           1.11.0 (using KDE 4.2.0)
OS:                Linux
Installed from:    Ubuntu Packages

Kmail doesn't show the contents of an email in an IMAP-folder inside the kmail-window (that happens often in inbox, kmail tries to check several folders/download emails but nothing happens), so I open the email in an own window. Here I can read the contents, but when I close that window, kmail crashes. 

Backtrace:
Anwendung: Kontact (kontact), Signal SIGABRT

Thread 1 (Thread 0xb4b1b970 (LWP 24460)):
[KCrash Handler]
#6  0xb7fd9430 in __kernel_vsyscall ()
#7  0xb59b18a0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb59b3268 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb5c56795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb5c56872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb5c56915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb10e8340 in ?? () from /usr/lib/libkmailprivate.so.4
#13 0xb114bcfa in ?? () from /usr/lib/libkmailprivate.so.4
#14 0xb0fb3654 in ?? () from /usr/lib/libkmailprivate.so.4
#15 0xb10bceb2 in ?? () from /usr/lib/libkmailprivate.so.4
#16 0xb5d5d0ff in QObjectPrivate::deleteChildren () from /usr/lib/libQtCore.so.4
#17 0xb6259928 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#18 0xb65ab921 in QMainWindow::~QMainWindow () from /usr/lib/libQtGui.so.4
#19 0xb6dfd849 in KMainWindow::~KMainWindow () from /usr/lib/libkdeui.so.5
#20 0xb6e403c7 in KXmlGuiWindow::~KXmlGuiWindow () from /usr/lib/libkdeui.so.5
#21 0xb134a688 in ?? () from /usr/lib/libkmailprivate.so.4
#22 0xb12b6b2a in ?? () from /usr/lib/libkmailprivate.so.4
#23 0xb5d5cdec in qDeleteInEventHandler () from /usr/lib/libQtCore.so.4
#24 0xb5d5e7a3 in QObject::event () from /usr/lib/libQtCore.so.4
#25 0xb6258004 in QWidget::event () from /usr/lib/libQtGui.so.4
#26 0xb65ac517 in QMainWindow::event () from /usr/lib/libQtGui.so.4
#27 0xb6dfca67 in KMainWindow::event () from /usr/lib/libkdeui.so.5
#28 0xb6e4126c in KXmlGuiWindow::event () from /usr/lib/libkdeui.so.5
#29 0xb62008ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#30 0xb62087fa in QApplication::notify () from /usr/lib/libQtGui.so.4
#31 0xb6d19fed in KApplication::notify () from /usr/lib/libkdeui.so.5
#32 0xb5d4ee61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#33 0xb5d4fae5 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#34 0xb5d4fcdd in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#35 0xb5d7982f in ?? () from /usr/lib/libQtCore.so.4
#36 0xb5031718 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#37 0xb5034dc3 in ?? () from /usr/lib/libglib-2.0.so.0
#38 0xb5034f81 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#39 0xb5d79478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb629aea5 in ?? () from /usr/lib/libQtGui.so.4
#41 0xb5d4d52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#42 0xb5d4d6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#43 0xb5d4fda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#44 0xb6200767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#45 0x0804c072 in _start ()