Let me know if you need more logs or details?
I attach the log:
[Wed Nov 04 14:02:27 2015] [error] [client XXX PHP Fatal error: Class 'DOMDocument' not found in /var/www/html/projeqtor/model/ColumnSelector.php on line 111, referer: http://XXXX:XXX/projeqtor/view/main.php
Just to help, the issue was resolved. The Php-xml was not installed correctly. After reinstall it, everything looks fine.
Check access rights.
Maybe you connected with profile with no write access.
To be sure, also check log file for errors and browser console for errors.
Cleaning of browser cache may also help.
Thanks Babynus, the problem was on my config, Php-xml was not installed correctly.
Right now, I have no problem.

