ov_pcm_seek to sample zero of Theora/Vorbis file hangs

Hi all,

I'm having a little trouble with a Vorbis decoder hanging (actually hard
looping the CPU) when I call ov_pcm_seek(&vorbis_file, 0) on a multiplexed
theora/vorbis file.  It appears to be the vorbisfile library that has the
problem.  The call to ov_pcm_seek never returns.

Seeking in non-multiplexed, including chained, files is OK.  Seeking to other
values, including sample 1, works OK.  Has anyone else seen this?

I have tested against Big Buck Bunny:
http://www.bigbuckbunny.org/index.php/download/

and plane.ogg from Wikipedia:
https://en.wikipedia.org/wiki/File:I-15bis.ogg

--ian