Yes, the add-ons are activated in Appareance > GP.
The recently changes is beacause I become aware of this. I’m working with two sites at the same time; one of them is correctly (with the last changes and the new estructure of the customizer with his add-ons activated correctly too).
But the other, althought the last update, doesn’t work like the first. I tried to reinstall as much the plugin as the child theme, but… in spite of that, doesn’t work.
Also has the last update of WordPress, so… I don’t know what more I can do : (
Thanks in advance!