I am facing the same issue. Also I am not able to change/show the backup settings for my sites. Editing an existing backup job shows the general tab, but clicking on the menu step to edit the destination for example, nothing happens.
it doesnt has an impact on the backup self, but of course it is a bug – or am I wrong?
If I click “Reload Table”, I would expect, that the shown table gets refreshed – but instead of that, I see the warning. If I close the warning, the shown table is empty and I have to reload the whole site to see the entries of the table again.
