looks like is_primary is not set for any pictures in a listing, so it doesn't show up in the popup or the initial full-page load (but there are 6 below)

[TimKJones]

The listing is :

http://www.cribspot.com/listing/2866/1104-Prospect-Ave-Ann-Arbor-MI-48104

Evan - I've assigned it to you, because I think this should be handled front-end....let me know if it's on my side.