Last August (2015) I created both a Summary Card with Large Image and a Product Card for my client, Centers Business Management (CBM). Both cards worked fine until recently. Both still validate (http://cbm1.com and http://cbm1.com/services.php, respectively). I’ve read past posts on similar issues without finding an answer. The code on the respective web pages hasn’t changed in any way that would effect the cards (that is, the meta information has not been changed). Ideas?
I am reading the troubleshooting’s “My Card doesn’t appear in the timeline” entry but admittedly not completely following it. (https://dev.twitter.com/cards/troubleshooting#timeline) Has Twitter changed how the cards display?
If the troubleshooting topic “My tweet is missing the image/video/summary text” is the case, will the card still validate? That is, since the cards I created for my client still validate, can I knock this possible cause off the list?