As I said, I have found that sometimes the page map just shows an empty page. So, I do a Exit Without Saving and then I click to go to another page > Edit Page > Page Map and usually it will show up then.
I haven't looked at the code for the building the page map, so I honestly don't know what the query is. I would guess it grabs the data from the routenew table though.
As for the pages not having titles, click Site Builder > Edit Page > Save Page and make sure you have entered something in the "Save the page name" area.
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