Version:           0.80.2 (using 4.3.1 (KDE 4.3.1) "release 9", KDE:KDE4:STABLE:Desktop / openSUSE_11.2)
Compiler:          gcc
OS:                Linux (x86_64) release 2.6.32.3-0.0.15.68cba77-desktop

This is all the hang information that I could get.
hang; no crash (about 10 min).

Überprüfung der Systemkonfiguration beim Start deaktiviert.

[Thread debugging using libthread_db enabled]
[New Thread 0x7f51ad269910 (LWP 24358)]
[New Thread 0x7f51ada6a910 (LWP 24357)]
[New Thread 0x7f51b7bd8910 (LWP 20402)]
0x00007f51c9541033 in __poll (fds=<value optimized out>, 
    nfds=<value optimized out>, timeout=89)
    at ../sysdeps/unix/sysv/linux/poll.c:87
87	  int result = INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
#0  0x00007f51c9541033 in __poll (fds=<value optimized out>, 
    nfds=<value optimized out>, timeout=89)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f51c4ba458c in g_main_context_poll (n_fds=<value optimized out>, 
    fds=<value optimized out>, priority=<value optimized out>, 
    timeout=<value optimized out>, context=<value optimized out>)
    at gmain.c:2904
#2  g_main_context_iterate (n_fds=<value optimized out>, 
    fds=<value optimized out>, priority=<value optimized out>, 
    timeout=<value optimized out>, context=<value optimized out>)
    at gmain.c:2586
#3  0x00007f51c4ba48d0 in IA__g_main_context_iteration (context=0x680520, 
    may_block=1) at gmain.c:2654
#4  0x00007f51ca7dd3a3 in QEventDispatcherGlib::processEvents (this=0x642cf0, 
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#5  0x00007f51c9d1331e in QGuiEventDispatcherGlib::processEvents (this=
    0xf3a310, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:202
#6  0x00007f51ca7b3712 in QEventLoop::processEvents (
    this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#7  0x00007f51ca7b3ae4 in QEventLoop::exec (this=0x7fff40c01590, flags=)
    at kernel/qeventloop.cpp:201
#8  0x00007f51ca0dd7ee in QDialog::exec (this=0x819bf20)
    at dialogs/qdialog.cpp:498
#9  0x00007f51cb30e672 in ?? () from /usr/lib64/libkdeui.so.5
#10 0x00007f51cb30e6f1 in ?? () from /usr/lib64/libkdeui.so.5
#11 0x00007f51ca7c9fbc in QMetaObject::activate (sender=0x8280870, 
    from_signal_index=<value optimized out>, 
    to_signal_index=<value optimized out>, argv=0xffffffffffffffff)
    at kernel/qobject.cpp:3113
#12 0x00007f51ca7cefff in QSingleShotTimer::timerEvent (this=0x8280870)
    at kernel/qtimer.cpp:298
#13 0x00007f51ca7c3f63 in QObject::event (this=0x8280870, e=0x9)
    at kernel/qobject.cpp:1075
#14 0x00007f51c9c802ac in QApplicationPrivate::notify_helper (this=0x67dbe0, 
    receiver=0x8280870, e=0x7fff40c01d70) at kernel/qapplication.cpp:4065
#15 0x00007f51c9c8757e in QApplication::notify (this=0x7fff40c02170, receiver=
    0x8280870, e=0x7fff40c01d70) at kernel/qapplication.cpp:4030
#16 0x00007f51cb39a8d6 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/lib64/libkdeui.so.5
#17 0x00007f51ca7b4ddc in QCoreApplication::notifyInternal (this=
    0x7fff40c02170, receiver=0x8280870, event=0x7fff40c01d70)
    at kernel/qcoreapplication.cpp:610
#18 0x00007f51ca7e071d in sendEvent (event=<value optimized out>, 
    receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#19 QTimerInfoList::activateTimers (event=<value optimized out>, 
    receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:594
#20 0x00007f51ca7dd678 in timerSourceDispatch (source=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f51c4ba0dde in g_main_dispatch (context=<value optimized out>)
    at gmain.c:1960
#23 IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2513
#24 0x00007f51c4ba47a8 in g_main_context_iterate (context=0x680520, 
    block=<value optimized out>, dispatch=<value optimized out>, 
    self=<value optimized out>) at gmain.c:2591
#25 0x00007f51c4ba48d0 in IA__g_main_context_iteration (context=0x680520, 
    may_block=1) at gmain.c:2654
#26 0x00007f51ca7dd3a3 in QEventDispatcherGlib::processEvents (this=0x642cf0, 
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#27 0x00007f51c9d1331e in QGuiEventDispatcherGlib::processEvents (this=
    0xf3a310, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:202
#28 0x00007f51ca7b3712 in QEventLoop::processEvents (
    this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#29 0x00007f51ca7b3ae4 in QEventLoop::exec (this=0x7fff40c020c0, flags=)
    at kernel/qeventloop.cpp:201
#30 0x00007f51ca7b5c99 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:888
#31 0x0000000000415736 in _start ()

P.S.: I have heard that Gentoo has developed a lot of patches for KDE4. What about incorporating them into the main base of KDE?