Thread:Talk:MediaWiki 1.19/Thumbnails didn't work since Update to 1.19/reply (23)/reply (30)

I don't see anything that could cause this in your .htaccess file.

Using https://commons.wikimedia.org/wiki/File:Example.svg as an example, I see https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Example.svg/600px-Example.svg.png for the top example. Does this match where you see http://www.example.com/wiki/images/0/03/Example-Logo.svg ?

If so, you need to set up svg thumbnailing.