Unable to edit headers & footers. I get the message header & footers cannot be detected. Any solution?

After the last set of Acrobat updates, I cannot edit headers & footers. I can add them to a document, but even if I try to edit them immediately after they are added, I get the message "Header & footers cannot be detected." Any solution?

It is a simple problem as I have described it. The files are created with AutoCAD, MathCAD, spreadsheets, Woodworks, etc. It just cropped up on 01/26.  I can delete the headers/footers and re-add them. But, it is a pain & the software should work.