I have the same error (internal data flow error), after upgrading from dapper to edgy. It happens when you open a divx file with external subtitles. Movies without subtitles works fine.
Resizing the window, displaying/hiding many times the side panel has no effect. I have the following packages installed in my system: dpkg --get-selections |grep gstreamer gstreamer0.10-alsa install gstreamer0.10-esd install gstreamer0.10-ffmpeg install gstreamer0.10-fluendo-mp3 install gstreamer0.10-gnomevfs install gstreamer0.10-plugins-base install gstreamer0.10-plugins-base-apps install gstreamer0.10-plugins-good install gstreamer0.10-tools install gstreamer0.10-x install gstreamer0.8-misc install gstreamer0.8-oss install gstreamer0.8-swfdec install gstreamer0.8-x install libgstreamer-gconf0.8-0 install libgstreamer-plugins-base0.10-0 install libgstreamer-plugins0.8-0 install libgstreamer0.10-0 install libgstreamer0.8-0 install totem-gstreamer install -- Internal data flow error. https://launchpad.net/bugs/70223 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs