marcherin
As other reviewers experienced, I also got two blank images on the distant server (not on my local apache server, surprisingly). As someone else mentioned, this is because all my pictures are jpg files and because there are two empty paths for png and gif images.
I removed the pngimages and the gifimages variables from lines 250 and 251 of the helper.php file and solved the problem that way.
Thank you your interest. I'll re-check...

