Featured images not loading in Mailchimp on iOS and now MacOSX

So this is weird. Images stopped loading only when viewing RSS emails from Mailchimp on current iOS devices using Apple Mail.

Then it stopped loading images on Mac OSX laptops too.

The RSS feed validates. Here’s my RSS mailchimp merge tags:

*|RSSITEMS:|*
*|RSSITEM:IMAGE|*
*|RSSITEM:TITLE|*
By *|RSSITEM:Author|*
*|RSSITEM:CONTENT_FULL|*
SHARE THIS ARTICLE:
*|RSSITEM:SHARE:Facebook,Twitter,LinkedIn|*
*|END:RSSITEMS|*

Any notion of why this is not working? Previously the plugin was totally great. Not sure what’s happening.