I got same error message, same account (Yahoo), but only one account. I have a core dump and the log from pidgin -d... do you need them?
It crashes consistently since I upgraded packages today. It says stuff about gstreamer not being able to open audio device, it may have something to do with flash running in iceweasel at the same time? Very annoying, crashed 4 times in last 15 minutes, impossible to have a reliable conversation. It often crashes while typing or just after i hit the send button. I checked, the message got through, but I didn't get the chance to see it in the little scrolling window bit... below is the messages just after the last message, until it died thanks, Paul (20:09:49) gstreamer: Could not open audio device for playback. Device is being used by another application. (pidgin:29108): GStreamer-CRITICAL **: Trying to dispose element play, but it is not in the NULL state. You need to explicitly set elements to the NULL state before dropping the final reference, to allow them to clean up. (20:09:49) gstreamer: Internal GStreamer error: state change failed. Please file a bug at http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer. (pidgin:29108): GStreamer-CRITICAL **: gst_element_set_state: assertion `GST_IS_ELEMENT (element)' failed (20:09:49) GLib-GObject: invalid uninstantiatable type `(null)' in cast to `GstObject' (pidgin:29108): GStreamer-CRITICAL **: gst_object_unref: assertion `((GObject *) object)->ref_count > 0' failed (20:09:49) gstreamer: Could not open audio device for playback. Device is being used by another application. (pidgin:29108): GStreamer-CRITICAL **: gst_element_set_state: assertion `GST_IS_ELEMENT (element)' failed (20:09:49) GLib-GObject: invalid uninstantiatable type `(null)' in cast to `GstObject' (pidgin:29108): GStreamer-CRITICAL **: gst_object_unref: assertion `((GObject *) object)->ref_count > 0' failed (20:09:49) gstreamer: Internal GStreamer error: state change failed. Please file a bug at http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer. (pidgin:29108): GStreamer-CRITICAL **: gst_element_set_state: assertion `GST_IS_ELEMENT (element)' failed (20:09:49) GLib-GObject: invalid uninstantiatable type `(null)' in cast to `GstObject' (pidgin:29108): GStreamer-CRITICAL **: gst_object_unref: assertion `((GObject *) object)->ref_count > 0' failed (20:09:49) GLib-GObject: invalid uninstantiatable type `(null)' in cast to `GstPlayBaseBin' pidgin: pthread_mutex_lock.c:285: __pthread_mutex_lock: Assertion `(-(e)) != 3 || !robust' failed.
