This bug is still present on KDE 4.3 RC. Tried to drag and drop a link from
Dolphin to VLC. I switched to VLC with the Cover Switch effect.

`dolphin -v`:
Qt: 4.5.2
KDE: 4.2.93 (KDE 4.2.93 (KDE 4.3 >= 20090623)) "release 1"
Dolphin: 1.2.80

Here is a full backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f8c17dae760 (LWP 21875))]

Thread 2 (Thread 0x7f8c0217a950 (LWP 17499)):
#0  0x00007f8c13cc1fdd in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f8c06bbc631 in metronom_sync_loop () from /usr/lib64/libxine.so.1
#2  0x00007f8c13cbe070 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f8c132b610d in clone () from /lib64/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8c17dae760 (LWP 21875)):
[KCrash Handler]
#5  QDragManager::move (this=0x1eff600, globalPos=@0x7fff1fde8730) at
kernel/qdnd_x11.cpp:1642
#6  0x00007f8c145326d9 in QDragManager::eventFilter (this=0x7f8c13537a00,
o=<value optimized out>, e=0x0) at kernel/qdnd_x11.cpp:1296
#7  0x00007f8c1401ad0c in
QCoreApplicationPrivate::sendThroughApplicationEventFilters (this=0x6b47c0,
receiver=0x1f1dae0, event=0x7fff1fde8710) at kernel/qcoreapplication.cpp:707
#8  0x00007f8c144afa76 in QApplicationPrivate::notify_helper
(this=0x7f8c13537a00, receiver=0x7f8c133060a8, e=0x0) at
kernel/qapplication.cpp:4031
#9  0x00007f8c144b84fa in QApplication::notify (this=<value optimized out>,
receiver=0x1f1dae0, e=0x7fff1fde8710) at kernel/qapplication.cpp:3758
#10 0x00007f8c15a0e5cb in KApplication::notify (this=0x7fff1fded6b0,
receiver=0x1f1dae0, event=0x7fff1fde8710) at
/usr/src/debug/kdelibs-4.2.93svn985654/kdeui/kernel/kapplication.cpp:302
#11 0x00007f8c1401b94c in QCoreApplication::notifyInternal
(this=0x7fff1fded6b0, receiver=0x1f1dae0, event=0x7fff1fde8710) at
kernel/qcoreapplication.cpp:610
#12 0x00007f8c144b7748 in QApplicationPrivate::sendMouseEvent
(receiver=0x1f1dae0, event=0x7fff1fde8710, alienWidget=0x0,
nativeWidget=0x1f1dae0, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7f8c14ec3f30) at
../../src/corelib/kernel/qcoreapplication.h:216
#13 0x00007f8c14521509 in QETWidget::translateMouseEvent (this=0x1f1dae0,
event=<value optimized out>) at kernel/qapplication_x11.cpp:4407
#14 0x00007f8c14520543 in QApplication::x11ProcessEvent (this=0x7fff1fded6b0,
event=0x7fff1fdea290) at kernel/qapplication_x11.cpp:3548
#15 0x00007f8c14547864 in x11EventSourceDispatch (s=0x6b7920, callback=0,
user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#16 0x00007f8c103b90fb in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#17 0x00007f8c103bc8cd in ?? () from /usr/lib64/libglib-2.0.so.0
#18 0x00007f8c103bca8b in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#19 0x00007f8c14044d3f in QEventDispatcherGlib::processEvents (this=0x688c30,
flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#20 0x00007f8c14546fef in QGuiEventDispatcherGlib::processEvents
(this=0x7f8c13537a00, flags=<value optimized out>) at
kernel/qguieventdispatcher_glib.cpp:202
#21 0x00007f8c1401a1d2 in QEventLoop::processEvents (this=<value optimized
out>, flags={i = 534685056}) at kernel/qeventloop.cpp:149
#22 0x00007f8c1401a5a4 in QEventLoop::exec (this=0xc28780, flags={i =
534685200}) at kernel/qeventloop.cpp:201
#23 0x00007f8c14531e27 in QDragManager::drag (this=0x1eff600, o=<value
optimized out>) at kernel/qdnd_x11.cpp:1969
#24 0x00007f8c144c2588 in QDrag::exec (this=0xc55110, supportedActions={i =
534685856}, defaultDropAction=Qt::IgnoreAction) at kernel/qdrag.cpp:282
#25 0x00007f8c16dbb85b in DragAndDropHelper::startDrag (this=0x98ca20,
itemView=0x1f18780, supportedActions={i = 534685936}, controller=<value
optimized out>)
    at
/usr/src/debug/kdebase-4.2.93svn985654/apps/dolphin/src/draganddrophelper.cpp:93
#26 0x00007f8c16da1470 in DolphinDetailsView::startDrag (this=0x1f18780,
supportedActions=<value optimized out>) at
/usr/src/debug/kdebase-4.2.93svn985654/apps/dolphin/src/dolphindetailsview.cpp:310
#27 0x00007f8c14987ab7 in QAbstractItemView::mouseMoveEvent (this=0x1f18780,
event=0x7fff1fdeb770) at itemviews/qabstractitemview.cpp:1552
#28 0x00007f8c16da161d in DolphinDetailsView::mouseMoveEvent
(this=0x7f8c13537a00, event=0x7fff1fdeb770) at
/usr/src/debug/kdebase-4.2.93svn985654/apps/dolphin/src/dolphindetailsview.cpp:280
#29 0x00007f8c14500986 in QWidget::event (this=0x1f18780, event=0x7fff1fdeb770)
at kernel/qwidget.cpp:7534
#30 0x00007f8c148567ab in QFrame::event (this=0x1f18780, e=0x7fff1fdeb770) at
widgets/qframe.cpp:559
#31 0x00007f8c1498c4ad in QAbstractItemView::viewportEvent (this=0x1f18780,
event=0x7fff1fdeb770) at itemviews/qabstractitemview.cpp:1476
#32 0x00007f8c149c3929 in QTreeView::viewportEvent (this=0x1f18780,
event=0x7fff1fdeb770) at itemviews/qtreeview.cpp:1266
#33 0x00007f8c1401ac48 in
QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized
out>, receiver=0x1f0cc50, event=0x7fff1fdeb770) at
kernel/qcoreapplication.cpp:726
#34 0x00007f8c144afadc in QApplicationPrivate::notify_helper (this=0x6b47c0,
receiver=0x1f0cc50, e=0x7fff1fdeb770) at kernel/qapplication.cpp:4052
#35 0x00007f8c144b84fa in QApplication::notify (this=<value optimized out>,
receiver=0x1f0cc50, e=0x7fff1fdeb770) at kernel/qapplication.cpp:3758
#36 0x00007f8c15a0e5cb in KApplication::notify (this=0x7fff1fded6b0,
receiver=0x1f0cc50, event=0x7fff1fdeb770) at
/usr/src/debug/kdelibs-4.2.93svn985654/kdeui/kernel/kapplication.cpp:302
#37 0x00007f8c1401b94c in QCoreApplication::notifyInternal
(this=0x7fff1fded6b0, receiver=0x1f0cc50, event=0x7fff1fdeb770) at
kernel/qcoreapplication.cpp:610
#38 0x00007f8c144b7748 in QApplicationPrivate::sendMouseEvent
(receiver=0x1f0cc50, event=0x7fff1fdeb770, alienWidget=0x1f0cc50,
nativeWidget=0x17fea30, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7f8c14ec3f30) at
../../src/corelib/kernel/qcoreapplication.h:216
#39 0x00007f8c14521509 in QETWidget::translateMouseEvent (this=0x17fea30,
event=<value optimized out>) at kernel/qapplication_x11.cpp:4407
#40 0x00007f8c14520543 in QApplication::x11ProcessEvent (this=0x7fff1fded6b0,
event=0x7fff1fded2f0) at kernel/qapplication_x11.cpp:3548
#41 0x00007f8c14547864 in x11EventSourceDispatch (s=0x6b7920, callback=0,
user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#42 0x00007f8c103b90fb in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#43 0x00007f8c103bc8cd in ?? () from /usr/lib64/libglib-2.0.so.0
#44 0x00007f8c103bca8b in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#45 0x00007f8c14044d3f in QEventDispatcherGlib::processEvents (this=0x688c30,
flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#46 0x00007f8c14546fef in QGuiEventDispatcherGlib::processEvents
(this=0x7f8c13537a00, flags=<value optimized out>) at
kernel/qguieventdispatcher_glib.cpp:202
#47 0x00007f8c1401a1d2 in QEventLoop::processEvents (this=<value optimized
out>, flags={i = 534697440}) at kernel/qeventloop.cpp:149
#48 0x00007f8c1401a5a4 in QEventLoop::exec (this=0x7fff1fded620, flags={i =
534697520}) at kernel/qeventloop.cpp:201
#49 0x00007f8c1401c894 in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:888
#50 0x00000000004395cd in main (argc=6, argv=0x7fff1fdedb98) at
/usr/src/debug/kdebase-4.2.93svn985654/apps/dolphin/src/main.cpp:94