If it works again, then it was indeed most likely an error of the server that hosts the images.
When images fails to load, there is often nothing I can do. I added these messages to at least indicate why an image doesn’t load. When an image fails to load, you can always press it and then it opens the image in the browser. That way you can verify if it’s a problem with Lemma, or if the image just doesn’t work at all (:
If it works again, then it was indeed most likely an error of the server that hosts the images.
When images fails to load, there is often nothing I can do. I added these messages to at least indicate why an image doesn’t load. When an image fails to load, you can always press it and then it opens the image in the browser. That way you can verify if it’s a problem with Lemma, or if the image just doesn’t work at all (: