VirtualBox crash on 10-Stable

Hello all,

I recently upgraded my 9-Stable box to 10-RC3 amd64. I did a completely
fresh installation and then added a few packages including KDE and
VirtualBox. I had trouble getting KDE running but fixed it with some
help from Jean-S=E9bastien P=E9dron (see
http://lists.freebsd.org/pipermail/freebsd-stable/2014-January/076703.html).

However, VirtualBox crashes for me every time I run it. I don't think
it's actually a VirtualBox problem per se - it's a KDE problem. I've
SVN'd base to 10-Stable and ports to HEAD. I then rebuilt world, my
kernel, KDE and VirtualBox (with the Qt4 front-end option) from ports.
But it keeps happening. It happens as both a normal user and as root. It
crashes almost immediately on starting the program - before any window
is shown.

Below is a gdb stack backtrace. I'm reluctant to rebuild everything with
debug symbols because it will take so long and so much disk space - but,
if it's necessary, I will. Before I do that I thought I'd see if anybody
else has seen this.

Can anybody please give me any hints. Thanks in advance for your help,
    Graham

(gdb) r
Starting program: /usr/local/bin/VirtualBox
(no debugging symbols found)...[New LWP 101403]
[New Thread 801c06400 (LWP 101403/VirtualBox)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 801c06400 (LWP 101403/VirtualBox)]
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x0000000800afa952 in __dynamic_cast (src_ptr=3D0x801e00de0,
src_type=3D0x810e1f3a8, dst_type=3D0x810e1f440, src2dst=3D0) at
.../../.././../gcc-4.6.4/libstdc++-v3/libsupc++/dyncast.cc:61
#2  0x0000000810947045 in KConfigGroup::reparent () from
/usr/local/kde4/lib/libkdecore.so.7
#3  0x00000008109401c6 in KConfigGroup::KConfigGroup () from
/usr/local/kde4/lib/libkdecore.so.7
#4  0x0000000810a0d8dc in KStandardDirs::addCustomized () from
/usr/local/kde4/lib/libkdecore.so.7
#5  0x0000000810a023cf in KComponentData::KComponentData () from
/usr/local/kde4/lib/libkdecore.so.7
#6  0x0000000810a02204 in KComponentData::KComponentData () from
/usr/local/kde4/lib/libkdecore.so.7
#7  0x0000000810a01d93 in KGlobal::findDirectChild_helper () from
/usr/local/kde4/lib/libkdecore.so.7
#8  0x0000000810a00f50 in KGlobal::dirs () from
/usr/local/kde4/lib/libkdecore.so.7
#9  0x0000000810a01020 in KGlobal::config () from
/usr/local/kde4/lib/libkdecore.so.7
#10 0x000000080f490eae in qt_plugin_instance () from
/usr/local/kde4/lib/kde4/plugins/gui_platform/libkde.so
#11 0x0000000807ca7039 in QApplicationPrivate::x11_apply_settings ()
from /usr/local/lib/qt4/libQtGui.so.4
#12 0x0000000807cae191 in qt_set_x11_resources () from
/usr/local/lib/qt4/libQtGui.so.4
#13 0x0000000807cac23f in qt_init () from /usr/local/lib/qt4/libQtGui.so.4
#14 0x0000000807c3a031 in QApplicationPrivate::construct () from
/usr/local/lib/qt4/libQtGui.so.4
#15 0x0000000807c3a95d in QApplication::QApplication () from
/usr/local/lib/qt4/libQtGui.so.4
#16 0x000000080525dfd9 in TrustedMain (argc=3D1, argv=3D0x7fffffffd548) at
CIShared.h:52
#17 0x00007fff01040805 in ?? ()
#18 0x000000080060d7d3 in _rtld_get_stack_prot () from /libexec/ld-elf.so.1
Previous frame inner to this frame (corrupt stack?)
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