JPG or JPEG?
I've noticed recently when someone posted some images and when people commented on them, thumbnails don't show up in the New Photos and New Comment galleries - see screenshot
Investigating this issue it seems that if anyone uploads an image with the file extension jpg - ie filename.jpg - you get thumbnails but if you upload with the extension jpeg ie filename.jpeg you don't get thumbnails.
As far as I can determine the file formats are the same - it just means that anyone uploading jpegs are likely to get less views as there are no thumbnails
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