When I upgraded two of my MediaWiki installations[1, 2] a while ago, images were no longer being displayed. I found out that this was due to some problem with a change to the image.image_name column.
Gladly, the fix was easy (adopted from the message in the mailing list):
ALTER TABLE image ADD COLUMN img_name2 varchar(255); UPDATE image SET img_name2=img_name; UPDATE image SET img_name=img_name2; ALTER TABLE image DROP COLUMN img_name2;
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[...] were just padded a bit. I have had a similar problem with MediaWiki before, so I remembered where to look within the hour this time. I tried a quick [...]