Check first if the webpage itself has a sidebar without the Custom Sidebars plugin. If the theme you’re using doesn’t support sidebars (for the entire site or even for that single page only), then Custom Sidebars won’t work with it. The plugin replaces sidebars, it doesn’t change the layout of your side to create them.
Both plugins were working perfectly but after the last update of Google Analytics by Yoast i got the problem …
Hello , i have exactly same problem as Pandur, my theme is: BresponZive.
For some reasons when Custom Sidebars and Google Analytics are both active , Custom Sidebars is not showing in the website,in the widget area is active and i can select which custom sidebar i want to use post/pages, after that nothing happens.