The picture in summary card is not showing in any browser I have (IE, Mozilla, Chrome, Safari). However is does show in the mobile app. It also shows in the Card Preview Twitter Card Tester on the Card Validator page.
In the same browsers, other’s Tweets that contain summary card content do show the picture.
I have reviewed the tags and compared them to URL’s that do seem to work, but cannot find any reason for the discrepancy.
Here is an example of a URL: http://bumbershootdesigns.blogspot.com/2013/12/the-25-days-of-christmas-cards-day-23.html
Thank you for your help.