Hi again Katrina. I’ve just noticed that the broken links and random images only seem to appear when I’m logged into WordPress (for my site). When I log out and view the site, the thumbnails do indeed seem to work.
Which is great, because it means it’s only me having the issue, and not my readers (I think? I’ll try and test with another WordPress user who is not an admin). However, it’s still a bit curious that the plugin would serve different images for me compared to everyone else … any ideas? (obviously much lower priority problem to solve!)