When I last generated my Webhelp using RH 2019 Classic, my contents pane had the table of contents. But now when I generate, the content pane on the left side of the page is empty, even though I can still see the TOC in RH itself. I also still see the .hhc file in my src directory. This is what I see online:

Any ideas why it would disappear? I did not knowingly change my TOC or generation properties.
Thanks in advance!