Thread:Project:Support desk/Broken Thumbnails in Mediawiki 1.20 (2)/reply

I've manually triggered the generation of that thumbnail through the thumb.php script:, and it now seems to work.

Does it happen with large images only? Maybe the script that generates the thumbnail failed somehow when generating this one on upload. This may happen if the server was under heavy load and the command that generates the thumbnail was taking too long (or too many memory) to generate it and it was killed.