Version:           KDE 4.2 RC1 (using Devel)
OS:                Linux
Installed from:    Compiled sources

On startup kontact crash with the message:
*** KMail got signal 11 (Crashing)
<unknown program name>(6599)/: Communication problem with  "kontact" , it probably crashed.
Error message was:  "org.freedesktop.DBus.Error.NoReply" : " "Message did not receive a reply (timeout by message bus)" "

Error log:
...
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x7f33ae6e96f0 (LWP 6600)]
(no debugging symbols found)
...
0x00007f33a78095f0 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (process 6600)]

Thread 1 (Thread 0x7f33ae6e96f0 (LWP 6600)):
#0  0x00007f33a78095f0 in nanosleep () from /lib/libc.so.6
#1  0x00007f33a7809447 in sleep () from /lib/libc.so.6
#2  0x00007f33aa02182f in ?? () from /usr/lib/libkdeui.so.5
#3  0x00007f33aa02216a in KCrash::defaultCrashHandler () from /usr/lib/libkdeui.so.5
#4  <signal handler called>
#5  0x00007f33a83e365b in QObject::setProperty () from /usr/lib/libQtCore.so.4
#6  0x00007f33a9ee1372 in KAction::setShortcut () from /usr/lib/libkdeui.so.5
#7  0x00007f3395c2b450 in ?? () from /usr/lib/libkmailprivate.so.4
#8  0x00007f3395c3cdce in ?? () from /usr/lib/libkmailprivate.so.4
#9  0x00007f3395e1b6be in KMMainWidget::createWidgets () from /usr/lib/libkmailprivate.so.4
#10 0x00007f3395e325c9 in KMMainWidget::KMMainWidget () from /usr/lib/libkmailprivate.so.4
#11 0x00007f3396467e55 in ?? () from /usr/lib/kde4/kmailpart.so
#12 0x00007f339646871f in KPluginFactory::createPartInstance<KMailPart> () from /usr/lib/kde4/kmailpart.so
#13 0x00007f33a8b14d0d in KPluginFactory::create () from /usr/lib/libkdecore.so.5
#14 0x00007f33ad485b6c in Kontact::Core::createPart () from /usr/lib/libkontactinterfaces.so.4
#15 0x00007f3397df2830 in ?? () from /usr/lib/kde4/kontact_kmailplugin.so
#16 0x00007f33ad486a59 in Kontact::Plugin::part () from /usr/lib/libkontactinterfaces.so.4
#17 0x00007f33ad6abd3b in Kontact::MainWindow::selectPlugin () from /usr/lib/libkontactprivate.so.4
#18 0x00007f33ad6a73fc in Kontact::MainWindow::loadSettings () from /usr/lib/libkontactprivate.so.4
#19 0x00007f33ad6af730 in Kontact::MainWindow::initObject () from /usr/lib/libkontactprivate.so.4
#20 0x00007f33ad6afc1a in Kontact::MainWindow::MainWindow () from /usr/lib/libkontactprivate.so.4
#21 0x000000000040376c in _start ()
#0  0x00007f33a78095f0 in nanosleep () from /lib/libc.so.6