No, I can't find anything that is common. Most of my files are docx. I've been working on a novel for a few months now and the option worked on it up until a few weeks ago. And now it no longer works. So that is on the very same document. It's a docx file. It's very aggravating, especially on a large document. I have another document that I open and/or update a couple of times a week. It's only about 8 pages long. I've used this document for a couple of years, it's a doc file and the option used to work on it but does not now. I just now opened about 20 documents, 5 or 6 doc files and the rest docx files and of the 20, only 5 still has the option working. Two are docx files and three are doc files. Things that make you say hmmmmm.