Thread:Project:Support desk/Urgent: Thumbnail not working in MediaWiki 1.19/reply (8)

You definitely should apply the patch!

If you have Git or Tortoise you can patch the files automatically.

If you don't have any of these you can just download the files and upload them via FTP. Mark posted this yesterday in the other thread: http://www.mediawiki.org/wiki/Thread:Talk:MediaWiki_1.19/Thumbnails_didn't_work_since_Update_to_1.19/reply_(36)

After updating the files make sure to create a subfolder called temp and to add the following line to localsettings.php $wgTmpDirectory = "$IP/images/temp";

Cheers.