Thread:Project:Support desk/Special page slows down, this gets spammed into the web server log/reply (7)

Well, "images don't show up" isn't verbose enough. There are many possibilities, like displaying an error message, resulting in a HTTP 404 error page or 500 error.

thumb.php is used to generate thumbnails from the 404 error handler. That manual page contains an invocation example. Try to use it where the image fails to "show up" and tell us if you got any error message. An example of page not displaying the thumbnail would be also welcome.