I followed the instructions for creating a new sidebar. I’m using the correct “Page with Sidebar” template. Everything seems to be fine, but after I select my new sidebar from the dropdown menu and hit update, the dropdown reverts back to original sidebar. For some reason it’s not taking.
I’m having the same issue. I can create a new sidebar, but when I update the page it simply reverts back to ‘page sidebar’ instead of the selected custom option. I can’t see an obvious reason for this.