From: "Jingyi C. Shi"
I uploaded a png image but no thumbnails created in the File page. As a
result, I cannot use the image in my articles.
Just went through something similar, but I did see thumbs on the File page in my case —
just not where I was using them!
In my case, I had uploaded a bunch of arbitrary files, keeping their file names. Then I
typed in the names to use via <randomimage> and <gallery>.
It turns out that half the images were named with “.jpg” and the others were named with
“.JPG”, and I use a case-sensitive file system! I had referred to them all as “.jpg”,
which caused the upper-case ones to be invisible.
So this particular gotcha might not apply to you.
You could try appending “?action=purge” to the URL, which *should* cause the thumbs to be
re-generated. I think.
You can also go to your thumbs directory via your file system, and see if the thumbs are
indeed there. They will be in “YourWikiRoot/images/thumbs”. Check the permissions on this
directory to make sure thumbs can be read by your web server.
:::: We don't have an energy crisis; we have a consumption crisis. -- Ozzie Zehner
:::: Jan Steinman, EcoReality Co-op <http://www.ecoreality.org/> ::::