YouTube video in sidebar doesn't work

Hi Massimo,
I’ve installed the plugin and soon tried the widget feature for the sidebar. The video is showed correctly, and the visualization is amazing, but clicking for playing the video nothing starts. It happens a strange thing: the video doesn’t start, while on the top of the browser page I can see the play icon on. So, something is playing but isn’t visible on the page.
You can see at iperortaggi.com/provalab

Maybe I didn’t setting something but I cannot find more informations.

Thank you in advance for the help.

Anna

https://wordpress.org/plugins/sz-video/