I finally sorted it out.
It seems that I had also issue with WP itself: some edit options in the edit mode not working, etc…
I uninstalled everything, deleted the DB and reinstalled WP then next gen. Now it works perfectly and i can finally beneficiate of this incredible plugin!
I’m hosted at OVHin France
Here the details of the settings of the server
Operating System : Linux
Server : Apache/2.2.X (OVH)
Memory usage : N/A
MYSQL Version : 4.0.25-standard-log
SQL Mode : Not set
PHP Version : 4.4.9
PHP Safe Mode : Off
PHP Allow URL fopen : On
PHP Memory Limit : N/A
PHP Max Upload Size : 8M
PHP Max Post Size : 16M
PHP Max Script Execute Time : 30s
PHP Exif support : Yes ( V1.4 )
PHP IPTC support : Yes
PHP XML support : Yes
