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If you get an error about "Error creating thumbnail: Unable to save thumbnail to destination", and you've checked that the "images" directory is writable by the web server, as well as any sub-directorysdirectories, then you might be able to solve the problem by '''unsetting''' the <code>[[mw:Manual:$wgTmpDirectory|$wgTmpDirectory]]</code> setting in your LocalSettings.php file. I had <code>$wgTmpDirectory = "{$wgUploadDirectory}/tmp";</code> in a v1_26 version of MediaWiki. Thumbnails were generated after I commented -out the setting(thus restoring the default from DefaultSettings.php -- which luckily worked for me).