After upgrading to 11.10, whenever I try to play .m4a files in Exaile there's a "playback error" and my "gstreamer installation is missing a plug-in." When I try to play the same files in Movie Player it asks if I'd like to search for a suitable 'MPEG-4 AAC demuxer" plugin. When i click yes it says I need to refresh the repository, and when I do so, there's a message saying the internet connection has failed and that there are no suitable plugins. I can play my .ogg files just fine, and the same .m4a files worked in the previous distribution. Are there any packages i need that might have been removed when I upgraded? I have all the gstreamer plugins I can find.