A family of Microsoft word processing software products for creating web, email, and print documents.
Thank you very much.
I am afraid it is document corruption. I have tried your suggestions.
I have installed Graham Mayor's add-in. My first impression is that it works well and that I should get used to it.
One possibility I was hesitant to mention is that Word does not handle large documents very well. My corrupt document is currently 324 pages and over 5 MB in size; it contains mostly text in English and Arabic with a small number of pictures and text boxes.
I have been editing it, adding and deleting contents, for a few years.
My experience with this particular document is that sometimes makes Word slow down or crash. I also feel that Word is not very good at handling text boxes.
I am grateful for all your advice and in particular the add-in link.