I also hit this bug, this time with gst-plugins-bad0.10 version 0.10.18-2. My gconf output was the same as Andres'. I found that got the same error text when I run 'gstreamer-properties', but gst-properties continues to load, and I am able to generate a test tone.
I then ran pidgin under gdb, it started up fine, audio worked, etc. I then ran pidgin normally again and it continued to function normally, so I was unable to continue debugging. I'll keep my eye out for the behavior to recur, and will try to do more debugging when it does.
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