http://en.wikipedia.org/w/index.php?title=Wikipedia:Graphic_Lab/Images_to_improve&diff=98320104&oldid=98314655

    This is the usual thumbnail-caching bug we've been seeing lately: if an
    image is reuploaded or purged while the proxy notification system is down
    for some reason, the proxies will continue to serve old thumbnails even
    though the central image server believes they've been properly purged. I've
    tried to fix the thumbs I could find for this image, but if you keep seeing
    stale thumbnails and reloading the page doesn't help, do this:

       1. Go to http://commons.wikimedia.org/w/thumb.php?f=M1913A_Rail_CrossSection.svg&w=120,
          replacing "120" with the width of the stale thumbnail in pixels.

       2. After repeating the previous step for all the broken thumbnail sizes,
          go to http://commons.wikimedia.org/w/index.php?title=Image:M1913A_Rail_CrossSection.svg&action=purge,
          and reload if necessary.

    The same trick should work for any image that's showing stale thumbnails.
    If even this doesn't help, go pester the server admins on #wikimedia-tech
    at IRC, or post to the technical village pump; in that case, the odds are
    the proxy notification is broken again and someone needs to go fix it.
    ?Ilmari Karonen (talk) 02:19, 4 January 2007 (UTC)