No Audio When Rendering with Vorbis Codec

When I render a video to Theora or WebM, there is no included audio track. mplayer says "Audio: no sound" when playing the resulting clip. No errors are reported in the application nor to stdout/stderr.

The audio plays when using the Project Monitor from within the application and rendering to mp4 includes the audio.

I am running Arch Linux with kdenlive 0.9.2. I have all the ladspa plugins available in the repos (cmt, calf, swh) and ffmpeg2theora installed as well.