Anyone have any idea as to why my S2 is reporting zero as the BestShare?

Received the miner last night.  Usual case of boards all over the place.  Pulled everything out.  Checked all cables.  Reseated all boards.  Fired it up and configured it.  It's been hashing perfectly all night.  Right around the 1000GH/s mark, 53C, posting shares to BTCGuild as would be expected.  Just zero BestShare value.  Not that I'm concerned about this.  I'm getting paid for the shares I am submitting.  Just curious.

Thanks!