One of my global header blocs is gone.
It took a fair amount of time to get right, so it is fairly frustrating. It was set to invisible so I could work on other areas without it interrupting, but now the bloc has completely gone from the Layer Tree.
It is still visible in the Page Navigator preview, but as soon as I make an edit to the page, the preview updates and it disappears.
Is there any chance of getting it back before I try to remake it?