nspluginviewer crashes when attempting to play wav url (konqueror and kontact/akreator)

uname -a
Linux 2.6.24-21-generic #1 SMP Mon Aug 25 16:57:51 UTC 2008 x86_64 GNU/Linux
Kubuntu 8.04
using KDE 4.1.1 & Konqueror 4.1.1
both konqueror-nsplugins 4:3.5.9-0ubuntu7.3 and konqueror-nsplugins-kde4 4:4.1.1-0ubuntu1~hardy1~ppa1 are installed

procedure:
in kontact:
   open a news item in akregator, follow an url (this normally open a konqueror-like new tab)
   right-click mouse button to get the context menu with "search" actions.
   search for a term in merriam webster dictionnary
   nspluginviewer crashes if you try to play the audio wav file provided for the word pronunciation
 (the url is a javascript:popWin('/cgi-bin/audio.pl?inter01s.wav=Internet'))

directly in konqueror:
   search for a term in merriam webster dictionary or alternatively open the word of the day on http://www.merriam-webster.com/dictionary/, then try to play the pronunciation.

The crashlog is given below.
Best regards
--------------------------------------
Application : nspluginviewer (nspluginviewer), signal SIGSEGV
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x7f6bc67e5780 (LWP 24062)]
[New Thread 0x42608950 (LWP 24069)]
[New Thread 0x41e07950 (LWP 24068)]
[New Thread 0x41606950 (LWP 24067)]
[New Thread 0x40e05950 (LWP 24066)]
[KCrash handler]
#5 0x00007f6bbc47d183 in ?? () from /usr/lib/mozilla/plugins/libvlcplugin.so
#6 0x00007f6bc4eb4345 in XtDispatchEventToWidget () from /usr/lib/libXt.so.6
#7 0x00007f6bc4eb4b9b in ?? () from /usr/lib/libXt.so.6
#8 0x00007f6bc4eb3d1b in XtDispatchEvent () from /usr/lib/libXt.so.6
#9 0x000000000041493c in ?? ()
#10 0x00007f6bc5da519d in KAppX11HackWidget::publicx11Event (this=0x0,
    e=0x751a90)
    at /build/buildd/kde4libs-4.1.1+really4.1.1/kdeui/kernel/kapplication.cpp:951
#11 0x00007f6bc5da22ca in KApplication::x11EventFilter (
    this=<value optimized out>, _event=0x7fffce824840)
    at /build/buildd/kde4libs-4.1.1+really4.1.1/kdeui/kernel/kapplication.cpp:1000
#12 0x00007f6bc3b13dbf in qt_x11EventFilter (ev=0x7fffce824840)
    at kernel/qapplication_x11.cpp:367
#13 0x00007f6bc3b215c9 in QApplication::x11ProcessEvent (this=0x7fffce824d10,
    event=0x7fffce824840) at kernel/qapplication_x11.cpp:2924
#14 0x00007f6bc3b483d3 in x11EventSourceDispatch (s=0x655690, callback=0,
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:148
#15 0x00007f6bc47963d4 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#16 0x00007f6bc47996e5 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x00007f6bc4799bcb in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#18 0x00007f6bc54b79df in QEventDispatcherGlib::processEvents (this=0x6516a0,
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:325
#19 0x00007f6bc3b4820f in QGuiEventDispatcherGlib::processEvents (this=0x0,
    flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#20 0x00007f6bc548db35 in QEventLoop::processEvents (
    this=<value optimized out>, flags=@0x7fffce824b20)
    at kernel/qeventloop.cpp:149
#21 0x00007f6bc548dc8b in QEventLoop::exec (this=0x7fffce824b60,
    flags=@0x7fffce824b70) at kernel/qeventloop.cpp:200
#22 0x00007f6bc548fcd9 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:849
#23 0x000000000041459f in ?? ()
#24 0x00007f6bc32a71c4 in __libc_start_main () from /lib/libc.so.6
#25 0x00000000004085d9 in _start ()
#0 0x00007f6bc3326b81 in nanosleep () from /lib/libc.so.6