I have a dozen MasterBorders, each with multiple pages. A Nav bar is set on each MB, and I have clicked the button "Apply to all pages".
I was working on one set of pages and had just completed updating page 4 out of 8. When I went to open page 5 for editing, the Nav bar lost its information, and no longer responds to changes on the Navigation Bar Properties panel.
This has happend multiple times before, and each time I have had to go to a MB that has a working Nav bar, copy it, go back to the failed page, delete the Nav bar, then paste the copied Nav bar, then adjust check boxes appropriately.
Another one of many annoying software errors.