Oh no! This almost sounds to me like the images aren’t uploading to your install. If you go to Media > Library are they listed?

Hi @toby1kenobi,

This sounds like a strange issue. Are other instances of the images rendering properly, like the ones in the initial Add Media dialog?

If you have access to the Chrome browser, you can use the Chrome developer tools to see what is happening with the network request for the image that’s supposed to be in the Edit Image dialog. Here’s a short video showing how to check that:
https://imgur.com/a/0A2jTlx

In addition, if you’re able to install plugins, you can install and activate the Health Check & Troubleshooting plugin. It will add a Dashboard > Health Check link, and if you click on that, you’ll see a Health Check page with a number of tabs. Its Debug Information tab provides details about your setup that you can copy and paste here to help identify the cause of your issue. Clicking the “Show copy and paste” button reveals a text field with text formatted for this forum.