This is a new MultimediaViewer install on a recently updated MediaWiki (1.28.2 to 1.29). No images on the wiki are working with MultimediaViewer and they all seem to load then show the error "Sorry, the file cannot be displayed". The download option as well as view in browser are both working so I know the images themselves are fine.
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Error details:
error: could not load image from http://tatteredwiki.org/images/6/6f/Lycus_Moss.png
URL: https://tatteredwiki.org/wiki/Lycus_Artois#/media/File:Lycus_Moss.png
user agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
screen size: 1680x1050
canvas size: 1293x738
image size: 300x300
thumbnail size: CSS: 738x738, screen width: 664.1999824047089, real width: 800