If you’re having problems loading images on Fosstodon, you will need to clear your browser data and log back in to fix the issue.
Firefox: https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
Chrome: https://support.google.com/chrome/answer/2392709?hl=en&co=GENIE.Platform=Desktop
Safari (iOS): https://support.apple.com/en-gb/HT201265
Safari (Mac): https://support.apple.com/en-gb/guide/safari/sfri47acf5d6/mac
@fosstodon I have an add-on on Firefox called 'Empty cache button'. I clicked on that, refreshed the Mastodon page, then the photos appeared as normal.