When selecting an image to a user profile, the original is saved in files/pictures, however no thumbnail is created. (also other app like Node-Gallery fail to create thumbnails).
Directories where the thumbnails should be stored were not created by default, so I created the missing folders myself (files/styles/thumbnail/public/pictures).
Turning off clean URL didn't work (as suggested by someone).
GD libraries are installed.
Any idea how to resolve this problem?
Thanks in advance,