What steps will reproduce the problem? 1. I've installed in a LAMP virtual machine for testing. 2. Add enable-thumbnails in configuration.php

I enabled debug and I checked error.log from apache and r.php/debug but I don't see errors.

The thumbnails it is show as the image attached. However, if I download the image, the file is not valid, and I can't see. I've test uploading with Mollify interface and with ssh too, but the problem is the same.

Maybe I need enable some php extension or similar? I don't see a requirements detailled.

Thank you.

Well, I notice that problem too today. However I have on my server all usual php extensions to manage thumbnails, all other software can do ..

Thumbnails require GD library installed in PHP server (http://php.net/manual/en/image.installation.php), I've added this in the wiki page.

I've seen some images that this library fails to process, but if this fails with all images, then it must be something else. First you should check for the GD library.

Ok, I checked it. GD library was not installed in the appliance, now is working fine with 3 images I use to check.

Thank you.

Great!