Thank yuo Dragos.
I succeeded in solving the problem by deactivating an audio-player functionality that probably interfered with javascript. I therefore disabled what was called “Continious Audio Player and AJAX” in the settings panel of the template.
indeed there was a warning:
* VERY IMPORTANT:Ajax loading is an advanced feature. Third party plugins that use Javascript might stop to work or make your site not works.If you have issues with your site, please turn off this feature.
Regards, Elisabetta
