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

Plasma crashed when i tried to open firefox along with some other kde application.

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 6498)]

Thread 3 (Thread 0xa9c1fb90 (LWP 6509)):
#0  0xb7fd8430 in __kernel_vsyscall ()
#1  0xb5835075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb64069ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65f16f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7974532 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb65f06ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb583150f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63f87ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa9055b90 (LWP 6518)):
#0  0xb7fd8430 in __kernel_vsyscall ()
#1  0xb5835075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb64069ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65f16f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9d834f2 in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb65f06ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb583150f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63f87ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb53ae6c0 (LWP 6498)):
[KCrash Handler]
#6  0xb7e0352d in ?? () from /usr/lib/libplasma.so.3
#7  0xb7deec53 in Plasma::Applet::focusInEvent () from /usr/lib/libplasma.so.3
#8  0xb6eed12d in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#9  0xb6f307af in QGraphicsWidget::sceneEvent () from /usr/lib/libQtGui.so.4
#10 0xb6f0b54c in ?? () from /usr/lib/libQtGui.so.4
#11 0xb6f0bfc0 in QGraphicsScene::setFocusItem () from /usr/lib/libQtGui.so.4
#12 0xb6f15904 in ?? () from /usr/lib/libQtGui.so.4
#13 0xb6f147a7 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#14 0xb69708ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#15 0xb697872e in QApplication::notify () from /usr/lib/libQtGui.so.4
#16 0xb76f406d in KApplication::notify () from /usr/lib/libkdeui.so.5
#17 0xb66e0e61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#18 0xb6f218bb in QGraphicsView::mousePressEvent () from /usr/lib/libQtGui.so.4
#19 0xb69c8949 in QWidget::event () from /usr/lib/libQtGui.so.4
#20 0xb6cfffd3 in QFrame::event () from /usr/lib/libQtGui.so.4
#21 0xb6d967df in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#22 0xb6f23d0f in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#23 0xb6d98d85 in ?? () from /usr/lib/libQtGui.so.4
#24 0xb66e004a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#25 0xb69708ca in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#26 0xb69790e1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#27 0xb76f406d in KApplication::notify () from /usr/lib/libkdeui.so.5
#28 0xb66e0e61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#29 0xb697836e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#30 0xb69e2656 in ?? () from /usr/lib/libQtGui.so.4
#31 0xb69e19e5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#32 0xb6a0b7aa in ?? () from /usr/lib/libQtGui.so.4
#33 0xb56766f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb5679da3 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb5679f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb670b478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#37 0xb6a0aea5 in ?? () from /usr/lib/libQtGui.so.4
#38 0xb66df52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#39 0xb66df6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#40 0xb66e1da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#41 0xb6970767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#42 0xb7f61d46 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#43 0x08048712 in _start ()

Thanks a lot...