Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH i686

What I was doing when the application crashed:
If I run more than one instance of a GTK+ application Plasma-Desktop Crashes.
EX: I can run Pidgin and firefox, no problem.
I cannot have mu buddies list open and be talking to someone in pidgin.
i cannot have 2 instances of firefox open either.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 26616)]

Thread 2 (Thread 0xa8436b70 (LWP 26623)):
#0  0xb7fed424 in __kernel_vsyscall ()
#1  0xb7d8eb95 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7ded047 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb65a8bd2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7dec032 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7d8a65c in start_thread () from /lib/libpthread.so.0
#6  0xb68251fe in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5e1d700 (LWP 26616)):
[KCrash Handler]
#6  0xa8791e5c in TaskManager::TaskItem::task () from /usr/lib/libtaskmanager.so.4
#7  0xa87bffcc in STasksTask::task () from /usr/lib/kde4/plasma_applet_stasks.so
#8  0xa87bd6d2 in STasksItem::updateState () from /usr/lib/kde4/plasma_applet_stasks.so
#9  0xa87bdc34 in STasksItem::STasksItem () from /usr/lib/kde4/plasma_applet_stasks.so
#10 0xa87b4518 in STasksApplet::itemAdded () from /usr/lib/kde4/plasma_applet_stasks.so
#11 0xa87b6d17 in STasksApplet::qt_metacall () from /usr/lib/kde4/plasma_applet_stasks.so
#12 0xb7ef09ac in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0xb7ef15e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xa878f843 in TaskManager::TaskGroup::itemAdded () from /usr/lib/libtaskmanager.so.4
#15 0xa8790295 in TaskManager::TaskGroup::add () from /usr/lib/libtaskmanager.so.4
#16 0xa8773d01 in TaskManager::AbstractGroupingStrategy::createGroup () from /usr/lib/libtaskmanager.so.4
#17 0xa877d05c in TaskManager::ProgramGroupingStrategy::programGrouping () from /usr/lib/libtaskmanager.so.4
#18 0xa877d5eb in TaskManager::ProgramGroupingStrategy::handleItem () from /usr/lib/libtaskmanager.so.4
#19 0xa8776f92 in TaskManager::GroupManagerPrivate::addTask () from /usr/lib/libtaskmanager.so.4
#20 0xa8779273 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#21 0xb7ef09ac in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#22 0xb7ef15e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xa8793253 in TaskManager::TaskManager::taskAdded () from /usr/lib/libtaskmanager.so.4
#24 0xa8795403 in TaskManager::TaskManager::windowAdded () from /usr/lib/libtaskmanager.so.4
#25 0xa879687f in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#26 0xb7ef09ac in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#27 0xb7ef15e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0xb7642363 in KWindowSystem::windowAdded () from /usr/lib/libkdeui.so.5
#29 0xb7645466 in KWindowSystemPrivate::addClient () from /usr/lib/libkdeui.so.5
#30 0xb7653a07 in NETRootInfo::update () from /usr/lib/libkdeui.so.5
#31 0xb7654512 in NETRootInfo::event () from /usr/lib/libkdeui.so.5
#32 0xb7645851 in KWindowSystemPrivate::x11Event () from /usr/lib/libkdeui.so.5
#33 0xb74f3816 in KApplication::x11EventFilter () from /usr/lib/libkdeui.so.5
#34 0xb3b6112f in PlasmaApp::x11EventFilter () from /usr/lib/libkdeinit4_plasma-desktop.so
#35 0xb6b11eb0 in ?? () from /usr/lib/libQtGui.so.4
#36 0xb6b2309e in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#37 0xb6b4ef62 in ?? () from /usr/lib/libQtGui.so.4
#38 0xb66bad98 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0xb66be3e0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#40 0xb66be513 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0xb7f056cc in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#42 0xb6b4e695 in ?? () from /usr/lib/libQtGui.so.4
#43 0xb7ed9579 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#44 0xb7ed99ca in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#45 0xb7edbe3f in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#46 0xb6ab07e7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#47 0xb3b4ab7d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#48 0x0804de42 in _start ()

Reported using DrKonqi