I did empty my cache. I’ve checked this on multiple computers (Mac and PC) using different browsers on two separate internet connections. For some reason on Firefox no Twitter card appears at all, but on Chrome I see a Twitter card with “array” instead of summary content.
I’m using the Summary Large Image card type
I do not use SEO by Yoast
Just let me know if you need more info. I can also provide a screenshot of the options page if that is helpful.
I was an early user of the plugin, so I think you have added additional options since I originally installed it that I am not utilizing.
Thank you so much for your help, this really is an otherwise fantastic plugin. I’ve recommended it to many people!