Possibly this occurs with some LADSPA plugins and was fixed already
with this commit:

commit ffee022601167cbaca0031df3ddf6db9ec20465d
Author: Dan Dennedy <[email protected]>
Date:   Wed Jun 27 23:15:01 2012 -0700

    fix some LADSPA crashing on dlclose on some systems (3538363)

On Tue, Aug 28, 2012 at 3:20 AM, Patrick Matthäi <[email protected]> wrote:
> Hey Dan,
>
> maybe an new issue which could be fixed with 0.8.2?
>
> Am 28.08.2012 11:37, schrieb David Smith:
>> Package: kdenlive
>> Version: 0.9.2-2
>> Severity: normal
>> Tags: upstream
>>
>> Application: kdenlive (0.9.2)
>> KDE Platform Version: 4.8.4 (4.8.4)
>> Qt Version: 4.8.2
>> Operating System: Linux 3.2.0-3-686-pae i686
>> Distribution: Debian GNU/Linux testing (wheezy)
>>
>> -- Information about the crash:
>> The application crashed while exiting the application.
>>
>> The crash can be reproduced some of the time.
>>
>> -- Backtrace:
>> Application: Kdenlive (kdenlive), signal: Segmentation fault
>> Using host libthread_db library "/lib/i386-linux-
>> gnu/i686/cmov/libthread_db.so.1".
>> [KCrash Handler]
>> #7  0xb4cbac91 in free () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> #8  0xb5779c4b in pool_close (self=0xb9869f68) at mlt_pool.c:213
>> #9  0xb5767119 in mlt_property_clear (self=0xb9869f90) at mlt_property.c:117
>> #10 mlt_property_close (self=0xb9869f90) at mlt_property.c:719
>> #11 0xb5767a9c in mlt_properties_close (self=0xb9864b10) at
>> mlt_properties.c:1327
>> #12 mlt_properties_close (self=0xb9864b10) at mlt_properties.c:1298
>> #13 0xb577a00d in mlt_pool_close () at mlt_pool.c:392
>> #14 0xb5778522 in mlt_factory_close () at mlt_factory.c:425
>> #15 0xb574a8cd in Mlt::Factory::close() () from /usr/lib/libmlt++.so.3
>> #16 0xb73c3126 in MainWindow::~MainWindow (this=this@entry=0xb9868348,
>> __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at /build/buildd-
>> kdenlive_0.9.2-2-i386-Vn4PnB/kdenlive-0.9.2/src/mainwindow.cpp:667
>> #17 0xb73c3232 in MainWindow::~MainWindow (this=0xb9868348,
>> __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at /build/buildd-
>> kdenlive_0.9.2-2-i386-Vn4PnB/kdenlive-0.9.2/src/mainwindow.cpp:668
>> #18 0xb5918563 in qDeleteInEventHandler (o=o@entry=0xb9868348) at
>> kernel/qobject.cpp:4277
>> #19 0xb591acf0 in QObject::event (this=0xb9868348, e=0xbb8f3370) at
>> kernel/qobject.cpp:1176
>> #20 0xb5cd44da in QWidget::event (this=0xb9868348, event=0xbb8f3370) at
>> kernel/qwidget.cpp:8830
>> #21 0xb6102f1c in QMainWindow::event (this=0xb9868348, event=0xbb8f3370) at
>> widgets/qmainwindow.cpp:1478
>> #22 0xb710aaf4 in KMainWindow::event (this=0xb9868348, ev=0xbb8f3370) at
>> .../../kdeui/widgets/kmainwindow.cpp:1084
>> #23 0xb7151af2 in KXmlGuiWindow::event (this=0xb9868348, ev=0xbb8f3370) at
>> .../../kdeui/xmlgui/kxmlguiwindow.cpp:126
>> #24 0xb5c7b47c in QApplicationPrivate::notify_helper (this=0xb9729d88,
>> receiver=0xb9868348, e=0xbb8f3370) at kernel/qapplication.cpp:4556
>> #25 0xb5c7ff24 in QApplication::notify (this=0xb9729d88, receiver=0xb9868348,
>> e=0xbb8f3370) at kernel/qapplication.cpp:4417
>> #26 0xb7035581 in KApplication::notify (this=0xbfac10c4, receiver=0xb9868348,
>> event=0xbb8f3370) at ../../kdeui/kernel/kapplication.cpp:311
>> #27 0xb590455e in QCoreApplication::notifyInternal (this=0xbfac10c4,
>> receiver=0xb9868348, event=0xbb8f3370) at kernel/qcoreapplication.cpp:915
>> #28 0xb590876d in sendEvent (event=<optimized out>, receiver=<optimized out>)
>> at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
>> #29 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
>> data=0xb9708130) at kernel/qcoreapplication.cpp:1539
>> #30 0xb59089ec in QCoreApplication::sendPostedEvents (receiver=0x0,
>> event_type=0) at kernel/qcoreapplication.cpp:1432
>> #31 0xb59366c4 in sendPostedEvents () at
>> .../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
>> #32 postEventSourceDispatch (s=0xb9729d38) at
>> kernel/qeventdispatcher_glib.cpp:279
>> #33 0xb4834633 in g_main_context_dispatch () from /lib/i386-linux-
>> gnu/libglib-2.0.so.0
>> #34 0xb48349d0 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
>> #35 0xb4834ab1 in g_main_context_iteration () from /lib/i386-linux-
>> gnu/libglib-2.0.so.0
>> #36 0xb5936841 in QEventDispatcherGlib::processEvents (this=0xb9708e88,
>> flags=...) at kernel/qeventdispatcher_glib.cpp:424
>> #37 0xb5d2e1fa in QGuiEventDispatcherGlib::processEvents (this=0xb9708e88,
>> flags=...) at kernel/qguieventdispatcher_glib.cpp:204
>> #38 0xb590302c in QEventLoop::processEvents (this=this@entry=0xbfac0fd8,
>> flags=...) at kernel/qeventloop.cpp:149
>> #39 0xb5903321 in QEventLoop::exec (this=0xbfac0fd8, flags=...) at
>> kernel/qeventloop.cpp:204
>> #40 0xb5908a9a in QCoreApplication::exec () at 
>> kernel/qcoreapplication.cpp:1187
>> #41 0xb5c792f4 in QApplication::exec () at kernel/qapplication.cpp:3817
>> #42 0xb7325382 in main (argc=5, argv=0xbfac11a4) at /build/buildd-
>> kdenlive_0.9.2-2-i386-Vn4PnB/kdenlive-0.9.2/src/main.cpp:89
>>
>> Report to http://kdenlive.org/mantis
>>
>>
>>
>> -- System Information:
>> Debian Release: wheezy/sid
>>    APT prefers testing
>>    APT policy: (500, 'testing')
>> Architecture: i386 (i686)
>>
>> Kernel: Linux 3.2.0-3-686-pae (SMP w/1 CPU core)
>> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
>> Shell: /bin/sh linked to /bin/dash
>>
>> Versions of packages kdenlive depends on:
>> ii  ffmpeg                    6:0.8.3-6
>> ii  kde-runtime               4:4.8.4-1
>> ii  kdenlive-data             0.9.2-2
>> ii  libc6                     2.13-35
>> ii  libgcc1                   1:4.7.1-2
>> ii  libgl1-mesa-glx [libgl1]  8.0.4-2
>> ii  libglu1-mesa [libglu1]    8.0.4-2
>> ii  libkdecore5               4:4.8.4-3
>> ii  libkdeui5                 4:4.8.4-3
>> ii  libkio5                   4:4.8.4-3
>> ii  libknewstuff3-4           4:4.8.4-3
>> ii  libknotifyconfig4         4:4.8.4-3
>> ii  libkrossui4               4:4.8.4-3
>> ii  libmlt++3                 0.8.0-3
>> ii  libmlt5                   0.8.0-3
>> ii  libnepomuk4               4:4.8.4-3
>> ii  libqjson0                 0.7.1-6
>> ii  libqt4-dbus               4:4.8.2-2+b1
>> ii  libqt4-network            4:4.8.2-2+b1
>> ii  libqt4-opengl             4:4.8.2-2+b1
>> ii  libqt4-script             4:4.8.2-2+b1
>> ii  libqt4-svg                4:4.8.2-2+b1
>> ii  libqt4-xml                4:4.8.2-2+b1
>> ii  libqtcore4                4:4.8.2-2+b1
>> ii  libqtgui4                 4:4.8.2-2+b1
>> ii  libsolid4                 4:4.8.4-3
>> ii  libsoprano4               2.7.6+dfsg.1-1
>> ii  libstdc++6                4.7.1-2
>> ii  libx11-6                  2:1.5.0-1
>> ii  libxau6                   1:1.0.7-1
>> ii  libxdmcp6                 1:1.1.1-1
>> ii  libxext6                  2:1.3.1-2
>> ii  melt                      0.8.0-3
>>
>> Versions of packages kdenlive recommends:
>> ii  dvdauthor        0.7.0-1.1+b2
>> ii  dvgrab           3.5-2
>> ii  frei0r-plugins   1.1.22git20091109-1.2
>> ii  genisoimage      9:1.1.11-2
>> ii  recordmydesktop  0.3.8.1+svn602-1+b1
>> ii  swh-plugins      0.4.15+1-6
>>
>> kdenlive suggests no packages.
>>
>
>
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