Images broken on permium articles

I have an issue where if I opt to read any premium article (I have a free account on the site) all the embedded images will be broken after opting in to read the full version of the page. When it is showing the preview it shows the top image as expected, but as soon as it switches to the full version they are all replaced by the broken image icon from the browser. This has been an issue for a long, long time. Thought you might like to know. Thanks!