since a couple of day, the Navigation builder for Apps is not working as before, there is not more New Navigation pannel on the left side. I have lost the whole navigation I built with my reports, and can not make it back to how it was as it is not saving the changes.
I now see the list of the reports in the app, but without the set up navigation and the section. Whenever I do 'Update the app', it has forgotten my whole setup and when I build it again, it does not save.
Any idea what is causing this bug and how to fix it?