@gianluca Del Gobbo
I have not received your config file…
But it is strange, in front-end it works in Admin side I can change the settings from qTranslate X this works when I save.
But the flags en language switch buttons are not there…
You use Domain Mapping I have never used that so I do not know how that works.
Your installation is stored in shockart.dev.flyer.it/ right?
Your site is shockart.net
Do you have all the settings for Domain Mapping checked?
When upgrading the plugin, remember to update domain_mapping.php and sunrise.php.
Ask your question also to the authors of that plugin. Perhaps they see a solution.