Some image thumbs aren't correctly shown. Browsers complain of a "image with
errors". However, a more in deep check shows that it's an html error page with
the image-expected content-type.
<html><head>
<title>Bad title</title> <body>
<h1>Bad title</h1>
<p>The requested page title was invalid, empty, or an incorrectly linked inter-l
anguage or inter-wiki title. It may contain one more characters which cannot be
used in titles.</p>
</body></html>
Some examples of this (taken from Special:Newimages) are
http://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Menemsha.jpg/120px-Menemsha.jpg
http://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Portphillip.gif/120px-Portphillip.gif
http://upload.wikimedia.org/wikipedia/commons/thumb/8/89/El_Toboso_Ayuntamiento.jpg/120px-El_Toboso_Ayuntamiento.jpg
http://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Marposad.jpg/120px-Marposad.jpg
http://en.wikipedia.org/wiki/History_of_cryptography#Classical_cryptography ->
http://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Skytala%26EmptyStrip-Shaded.png/180px-Skytala%26EmptyStrip-Shaded.png
Version: unspecified
Severity: major
URL: http://upload.wikimedia.org/wikipedia/commons/thumb/8/89/El_Toboso_Ayuntamiento.jpg/120px-El_Toboso_Ayuntamiento.jpg