Contact Ref Field munted - autocomplete works but saving set cid to single digit

Just trying the new Contact Ref Field in D7

So i put in the name in Autocomplete and it fills and replaces with cid: 624

When I saved, the field showed no data - so i Edited and saw the field was now showing cid: 6

And no there isn't a civicrm record for Id 6 - i guess if there was it would just be showing the wrong result, not a blank field

And just tested that - saved using a contact whose id = 102 and it saved as id=1 ie Inner City Arts

Might the field be set to being a single digit?

Had a snoop around in field_config table and see

data longblob Binary - do not edit (862 B)

Not sure i can shed anymore light on this. Anyone able to help?

Forum post here http://forum.civicrm.org/index.php?topic=19222