Custom Sidebar doesn’t works

Hi
I use the lastest version of wordpress and a Enfold theme. I try to create a custom sidebar and when click on save (save the sidebar) the pop up become out of focus and do nothing. Then i clicked out of this pop up and the sidebar didn’t displayed. I clicked on widget menu to reload the widget page and the Sidebar was displayed. Now i want to load this new sidebar only for specific category posts.
If i click on Sidebar location the popup become out of focus and I can’t modify any settings.