I have installed a new copy of PrestaShop 1.6.0.9 and when I tried to upload somethimes the images are uploaded, but some thumbnails were missing, or some of the images were not uploaded at all.
I did a long research what the problem could be. What I found (for example folder permissions, memory_limit or bugs in older PS versions) was not my case. Now I'm thinking that there is some misconfiguration of the server, but I didn't find anything suspicious...
Here is my php info http://evroweb.com/teos/i.php
P.S. I noticed that with a memory_limit of 128M I cannot access the back-office Modules page. I accessed it when I increased it to 256M.
Any suggestions please?