Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          g++ (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) 
OS:                Linux

Was downloading new plasma themes to try out, downloaded a few and installed and applied the themes. then suddenly plasma crashed. attached backtrace.
hth
Application: Plasma Workspace (plasma), signal SIGSEGV
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[New Thread -1263552800 (LWP 28347)]
[New Thread -1340421232 (LWP 28608)]
[New Thread -1319249008 (LWP 28596)]
[New Thread -1302393968 (LWP 28349)]
[New Thread -1293800560 (LWP 28348)]
[Current thread is 0 (LWP 28347)]

Thread 5 (Thread -1293800560 (LWP 28348)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb6831676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6894a06 in QWaitCondition::wait (this=0x81afaf8, mutex=0x81afaf4, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb6002e6d in QHostInfoAgent::run (this=0x81afae8) at /home/kde-devel/kdesvn/qt-copy/src/network/kernel/qhostinfo.cpp:247
#4  0xb6894327 in QThreadPrivate::start (arg=0x81afae8) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#5  0xb682d46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb5c736de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 4 (Thread -1302393968 (LWP 28349)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb6831676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6894a06 in QWaitCondition::wait (this=0x817601c, mutex=0x8176018, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb2f85e96 in RenderThread::run (this=0x8176010) at /home/kde-devel/kdesvn/kdebase/workspace/plasma/containments/desktop/renderthread.cpp:84
#4  0xb6894327 in QThreadPrivate::start (arg=0x8176010) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#5  0xb682d46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb5c736de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread -1319249008 (LWP 28596)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb6831676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6894a06 in QWaitCondition::wait (this=0x874c30c, mutex=0x874c308, time=4294967295) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qwaitcondition_unix.cpp:88
#3  0xb2f85e96 in RenderThread::run (this=0x874c300) at /home/kde-devel/kdesvn/kdebase/workspace/plasma/containments/desktop/renderthread.cpp:84
#4  0xb6894327 in QThreadPrivate::start (arg=0x874c300) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#5  0xb682d46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb5c736de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread -1340421232 (LWP 28608)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb5c6c2a1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb6950e0f in QProcessManager::run (this=0x80810f8) at /home/kde-devel/kdesvn/qt-copy/src/corelib/io/qprocess_unix.cpp:307
#3  0xb6894327 in QThreadPrivate::start (arg=0x80810f8) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qthread_unix.cpp:190
#4  0xb682d46b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb5c736de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread -1263552800 (LWP 28347)):
[KCrash Handler]
#6  QMutex::lock (this=0x2b) at /home/kde-devel/kdesvn/qt-copy/src/corelib/thread/qmutex.cpp:153
#7  0xb696cf0c in QCoreApplication::postEvent (receiver=0x8dd8098, event=0x9107a60, priority=0) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:971
#8  0xb696d1ac in QCoreApplication::postEvent (receiver=0x8dd8098, event=0x9107a60) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:925
#9  0xb69797f4 in QObject::deleteLater (this=0x8dd8098) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qobject.cpp:2041
#10 0xb7e01452 in Plasma::ContainmentPrivate::toggleDesktopImmutability (this=0x8163a80) at /home/kde-devel/kdesvn/kdebase/workspace/libs/plasma/containment.cpp:1079
#11 0xb7e098a6 in Plasma::Containment::qt_metacall (this=0x8175f80, _c=QMetaObject::InvokeMetaMethod, _id=43, _a=0xbf9f62fc)
    at /home/kde-devel/kdesvn/build/kdebase/workspace/libs/plasma/containment.moc:130
#12 0xb2f7694a in DefaultDesktop::qt_metacall (this=0x8175f80, _c=QMetaObject::InvokeMetaMethod, _id=43, _a=0xbf9f62fc)
    at /home/kde-devel/kdesvn/build/kdebase/workspace/plasma/containments/desktop/desktop.moc:75
#13 0xb697caea in QMetaObject::activate (sender=0x811e050, from_signal_index=<value optimized out>, to_signal_index=6, argv=<value optimized out>)
    at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qobject.cpp:3007
#14 0xb697cdf0 in QMetaObject::activate (sender=0x811e050, m=0xb67ba3f8, from_local_signal_index=1, to_local_signal_index=2, argv=0xbf9f62fc)
    at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qobject.cpp:3100
#15 0xb619d3c1 in QAction::triggered (this=0x811e050, _t1=false) at .moc/release-shared/moc_qaction.cpp:216
#16 0xb619e37f in QAction::activate (this=0x811e050, event=QAction::Trigger) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qaction.cpp:1119
#17 0xb652ca5d in QMenuPrivate::activateAction (this=0x90f6808, action=0x811e050, action_e=QAction::Trigger, self=true) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qmenu.cpp:1005
#18 0xb652f07f in QMenu::mouseReleaseEvent (this=0xbf9f7260, e=0xbf9f6a8c) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qmenu.cpp:2160
#19 0xb701cf8c in KMenu::mouseReleaseEvent (this=0xbf9f7260, e=0xbf9f6a8c) at /home/kde-devel/kdesvn/kdelibs/kdeui/widgets/kmenu.cpp:452
#20 0xb61f1cb3 in QWidget::event (this=0xbf9f7260, event=0xbf9f6a8c) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qwidget.cpp:6927
#21 0xb652a68f in QMenu::event (this=0xbf9f7260, e=0xbf9f6a8c) at /home/kde-devel/kdesvn/qt-copy/src/gui/widgets/qmenu.cpp:2256
#22 0xb61a375f in QApplicationPrivate::notify_helper (this=0x807b768, receiver=0xbf9f7260, e=0xbf9f6a8c) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3772
#23 0xb61aa291 in QApplication::notify (this=0x8062648, receiver=0xbf9f7260, e=0xbf9f6a8c) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3501
#24 0xb6f468fa in KApplication::notify (this=0x8062648, receiver=0xbf9f7260, event=0xbf9f6a8c) at /home/kde-devel/kdesvn/kdelibs/kdeui/kernel/kapplication.cpp:311
#25 0xb696c469 in QCoreApplication::notifyInternal (this=0x8062648, receiver=0xbf9f7260, event=0xbf9f6a8c) at /home/kde-devel/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:583
#26 0xb61a9880 in QApplicationPrivate::sendMouseEvent (receiver=0xbf9f7260, event=0xbf9f6a8c, alienWidget=0x0, nativeWidget=0xbf9f7260, buttonDown=0xb67d6b50, lastMouseReceiver=@0xb67d6b54)
    at ../../include/QtCore/../../../../qt-copy/src/corelib/kernel/qcoreapplication.h:218
#27 0xb6204e89 in QETWidget::translateMouseEvent (this=0xbf9f7260, event=0xbf9f6f48) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:4067
#28 0xb62045c6 in QApplication::x11ProcessEvent (this=0x8062648, event=0xbf9f6f48) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qapplication_x11.cpp:3133
#29 0xb62296c4 in x11EventSourceDispatch (s=0x8080ed8, callback=0, user_data=0x0) at /home/kde-devel/kdesvn/qt-copy/src/gui/kernel/qguieventdispatcher_glib.cpp:148
#30 0xb5a3611c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb5a3955f in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x08080298 in ?? ()
#33 0x00000000 in ?? ()