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Yesterday everything was working fine, today it's not.
The images are still in the library, but in the edit page they don't show.
My first thought is that a plugin broke something, but I wanted to ask before starting to investigate.
I hope this doesn't break any rules, thanks for your help.

Step 1, right click and inspect to see what the errors are. Are they 404ing? What is the path they are looking at? Does that path exist? Did you change your site URL or something? If so you may need to do a find/replace in the database to update all the paths/links