gstreamer error in banshee/totem

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https://bbs.archlinux.org – my audio seems to work just fine, system sounds work, and cmus seems to play everything i throw at it.  but gstreamer doesn't seem to be working, and all i get are cryptic errors.  when i start banshee from the command line, the only error i get is:[Error 20:55:41.325] GStreamer stream error: Failedand the music doesn't play.  totem gives me a similar and equally useless error message.  i have attempted to play both mp3 and m4a files, haven't tried ogg or any other formats.  i have also tried compiling gstreamer0.10 from abs and installing from there, as (HowTos)