From: "Jingyi C. Shi" jshizhang@gmail.com
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.
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