Please describe the problem:
On DVDs that have been dubbed into another language, DVD audio cuts out when you select another language from the Sound menu if the DVD is currently playing back. 

Steps to reproduce:
1.  Insert a DVD and play it.
2.  Leave the DVD playing. Choose a different language, e.g. French. from the sound menu.
3.  Sound will cut out.
4.  Rewind or seek.  The disc will seek and the proper audio stream will resume.

Choosing one after the other has no different effect.  E.g. leave the disc in play, and switch from English to French to Spanish to Director's Commentary.  Any change forces you to rewind or seek to get the audio back.

Actual results:
Sound cuts out.

Expected results:
Sound changes to another language.

Does this happen every time?
This happens on every multi-language DVD I have tried.

Other information:
I am willing to hunt this down and provide backtraces or dumps or whatever is necessary.  Let me know.  Here are the versions I have installed:

steveb@lithium:~$ dpkg -l |grep dvd
ii  dvd+rw-tools                               6.1-2ubuntu1                      DVD+-RW/R tools
ii  gstreamer0.8-dvd                           0.8.12-4ubuntu1                   DVD plugin for GStreamer
ii  libdvdcss2                                 1.2.5-1                           a portable abstraction library for DVD decry
ii  libdvdnav4                                 0.1.9-3                           The DVD navigation library
ii  libdvdread3                                0.9.6-3ubuntu1                    library for reading DVDs
steveb@lithium:~$ dpkg -l |grep gstr
ii  gstreamer0.10-alsa                         0.10.10-1ubuntu1                  GStreamer plugin for ALSA
ii  gstreamer0.10-esd                          0.10.4-0ubuntu3                   GStreamer plugin for ESD
ii  gstreamer0.10-gnomevfs                     0.10.10-1ubuntu1                  GStreamer plugin for GnomeVFS
ii  gstreamer0.10-plugins-base                 0.10.10-1ubuntu1                  GStreamer plugins from the "base" set
ii  gstreamer0.10-plugins-base-apps            0.10.10-1ubuntu1                  GStreamer helper programs from the "base" se
ii  gstreamer0.10-plugins-base-dbg             0.10.10-1ubuntu1                  GStreamer plugins from the "base" set
ii  gstreamer0.10-plugins-good                 0.10.4-0ubuntu3                   GStreamer plugins from the "good" set
ii  gstreamer0.10-plugins-good-dbg             0.10.4-0ubuntu3                   GStreamer plugins from the "good" set
ii  gstreamer0.10-plugins-ugly                 0.10.4-0ubuntu2                   GStreamer plugins from the "ugly" set
ii  gstreamer0.10-plugins-ugly-dbg             0.10.4-0ubuntu2                   GStreamer plugins from the "ugly" set
ii  gstreamer0.10-tools                        0.10.10-1ubuntu1                  Tools for use with GStreamer
ii  gstreamer0.10-x                            0.10.10-1ubuntu1                  GStreamer plugins for X11 and Pango
ii  gstreamer0.8-dvd                           0.8.12-4ubuntu1                   DVD plugin for GStreamer
ii  gstreamer0.8-misc                          0.8.12-4ubuntu1                   Collection of various GStreamer plugins
ii  libgstreamer-gconf0.8-0                    0.8.12-4ubuntu1                   GConf support for GStreamer
ii  libgstreamer-plugins-base0.10-0            0.10.10-1ubuntu1                  GStreamer libraries from the "base" set
ii  libgstreamer-plugins0.8-0                  0.8.12-4ubuntu1                   Various GStreamer libraries and library plug
ii  libgstreamer0.10-0                         0.10.10-1ubuntu1                  Core GStreamer libraries and elements
ii  libgstreamer0.10-0-dbg                     0.10.10-1ubuntu1                  Core GStreamer libraries and elements
ii  libgstreamer0.8-0                          0.8.12-2                          Core GStreamer libraries, plugins, and utili
ii  totem-gstreamer                            2.16.1-1ubuntu1                   A simple media player for the Gnome desktop 


Here is some stdout:
steveb@lithium:~$ totem --debug dvd://
** Message: w 420 h 430 sidebar 0
No accelerated IMDCT transform found
No accelerated IMDCT transform found
No accelerated IMDCT transform found
No accelerated IMDCT transform found
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture

** (totem:7629): CRITICAL **: totem_lang_table_parse_start_tag: assertion `strlen (*attr_values) == 3' failed
** Message: FIXME: gst_mpeg_demux_sync_stream_to_time

=================================
Here is a second stdout with a few different messages:
steveb@lithium:~$ totem --debug dvd://
** Message: w 420 h 430 sidebar 0
No accelerated IMDCT transform found
No accelerated IMDCT transform found
No accelerated IMDCT transform found
No accelerated IMDCT transform found
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture

** (totem:7629): CRITICAL **: totem_lang_table_parse_start_tag: assertion `strlen (*attr_values) == 3' failed
** Message: FIXME: gst_mpeg_demux_sync_stream_to_time

** Message: Couldn't initialize lirc.

libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_07_1.VOB (0x0029eaed)!!
libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_08_1.VOB (0x0029ebc3)!!
No accelerated IMDCT transform found
No accelerated IMDCT transform found
No accelerated IMDCT transform found
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture
** Message: don't know how to handle video/x-dvd-subpicture

** (totem:7629): WARNING **: Internal GStreamer error: clock problem.  Please file a bug at http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer. [gstbaseaudiosink.c(619): gst_base_audio_sink_render (): /play/abin/audiosinkbin/audio-sink/bin7/autoaudiosink1/autoaudiosink1-actual-sink-alsadmix:
Unexpected discontinuity in audio timestamps of more than half a second]


** Message: Couldn't initialize lirc.