We just made a page secure on our http://mindfulmovement.org/ site for eCommerce but in doing so, we found that the path to the background image file bg-integrity-91.jpg file is a remote one rather than in our theme. We had 2 errors on https://www.whynopadlock.com/.
I had to download it from the remote location, install it locally, then was able to get the padlock for the green light from https://www.whynopadlock.com/