When adding or editing an 'Excerpt Include' macro to a page:
1. In "Page Containing the Excerpt", type in a page name with a forward slash in the name (example: "Mobile/Web App")
2. The auto-fill dropdown will correctly find the page
3. Select the page
4. The Preview area shows "The page Mobile/Web App does not exist."
5. Save the macro, and then preview or save the page and you get a message saying "The page Mobile/Web App does not exist."