Child theme breaks navigation menu

Creating and activating a child theme with Courage seems to break my custom navigation menu. Even if I don’t make any changes to the bare-bones child theme, the menu breaks. I’ve tried creating the child theme myself, using two different child-theme creation plugins, and uploading the blank child theme provided on the ThemeZee website for the courage theme. All of them break my menu. I’ve tried going into the menu are on my dashboard and saving the settings, but that didn’t help either. Any suggestions would be very much appreciated. Thanks.
Bruce