Dcgrib2 problems w/Canadian GEM

A different problem from the NAM tile bug which I still can't find a fix
for... I'm downloading the Canadian GEM (hi-res) data and running it through
dcgrib2, and every other time set is corrupted.

850mb at F03 - http://skywatch.org/cmc1.gif
850mb at F06 - http://skywatch.org/cmc2.gif

- Rob