Version:            (using KDE 4.2.0)
OS:                Linux
Installed from:    Unspecified Linux

Running Archlinux on an amd64x2 machine. Installed kde 4.2 and did startx. kde worked and I installed wine and then guild wars. when guild wars logged into the net the screen went black and froze. I had to reboot and since when I boot kde comes up to the splash screen and goes black with mouse arrow. I can use alt+f2 and ge any application that way and use it. but the plasma screen,system tray and icons are gone and I get a black screen. I get a plasma workspacd -the kde crash handler -a fatal error occurred. this is the bug report
Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 3819)]

Thread 2 (Thread 0xa9364b90 (LWP 3820)):
#0  0xb7fa2424 in __kernel_vsyscall ()
#1  0xb6878c55 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb68f36a2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb7a1aa0a in ?? () from /usr/lib/libQtNetwork.so.4
#4  0x089ddd80 in ?? ()
#5  0x089ddd7c in ?? ()
#6  0xffffffff in ?? ()
#7  0xb6a6b000 in ?? ()
#8  0xa9364300 in ?? ()
#9  0xb7fb141b in _dl_fixup () from /lib/ld-linux.so.2
#10 0xb68f2910 in ?? () from /usr/lib/libQtCore.so.4
#11 0x089ddd70 in ?? ()
#12 0x00000000 in ?? ()

Thread 1 (Thread 0xb4940720 (LWP 3819)):
[KCrash Handler]
#6  0xb69e557a in QTimer::stop () from /usr/lib/libQtCore.so.4
#7  0xb7f71ca7 in PanelView::updatePanelGeometry () from /usr/lib/libkdeinit4_plasma.so
#8  0xb7f734d8 in PanelView::pinchContainment () from /usr/lib/libkdeinit4_plasma.so
#9  0xb7f749a4 in PanelView::PanelView () from /usr/lib/libkdeinit4_plasma.so
#10 0xb7f796e2 in PlasmaApp::createView () from /usr/lib/libkdeinit4_plasma.so
#11 0xb7f79916 in PlasmaApp::containmentAdded () from /usr/lib/libkdeinit4_plasma.so
#12 0xb7f7bcac in PlasmaApp::qt_metacall () from /usr/lib/libkdeinit4_plasma.so
#13 0xb69de77b in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xb69decd2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb7e516f3 in Plasma::Corona::containmentAdded () from /usr/lib/libplasma.so.3
#16 0xb7e53098 in Plasma::Corona::loadLayout () from /usr/lib/libplasma.so.3
#17 0xb7e54141 in Plasma::Corona::initializeLayout () from /usr/lib/libplasma.so.3
#18 0xb7f7856d in PlasmaApp::corona () from /usr/lib/libkdeinit4_plasma.so
#19 0xb7f7a625 in PlasmaApp::setupDesktop () from /usr/lib/libkdeinit4_plasma.so
#20 0xb7f7bcdb in PlasmaApp::qt_metacall () from /usr/lib/libkdeinit4_plasma.so
#21 0xb69de77b in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#22 0xb69decd2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb69e5777 in ?? () from /usr/lib/libQtCore.so.4
#24 0x087b3e28 in ?? ()
#25 0xb6a68448 in ?? () from /usr/lib/libQtCore.so.4
#26 0x00000000 in ?? ()

when I go to konsole and type plasma I get
$ Xlib:  extension "Generic Event Extension" missing on display ":0.0".
Xlib:  extension "Generic Event Extension" missing on display ":0.0".
Xlib:  extension "Generic Event Extension" missing on display ":0.0".
QLayout: Attempting to add QLayout "" to QWidget "", which already has a layout
Object::connect: Attempt to bind non-signal TaskManager::TaskGroup::editRequest()
Object::connect: Attempt to bind non-signal TaskManager::TaskGroup::editRequest()
QCoreApplication::postEvent: Unexpected null receiver
plasma(3822): Communication problem with  "plasma" , it probably crashed.
Error message was:  "org.freedesktop.DBus.Error.NoReply" : " "Message did not receive a reply (timeout by message bus)" "