Documents hung up, Word won't close due to "Changes made..to global template Normal.dotm"

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I've been getting a pop-up issue on occasion while in Word. After saving a document and trying to exit Word, I receive a Warning box that reads "Changes made that affect global template, Normal.dotm. Do you want to save those changes?" I went to Help to find out what this was about and read to uncheck the prompt for saving changes to normal.dotm. I went into Word options but that box was already not checked! If I click on "No" to saving the global changes, another box appears that says "Saving auto recovery file is postponed for Normal.dotm".



I don't see these messages with every document written or saved - just occasionally. And when I do see them, the document frequently cannot be saved or if saved, cannot be opened. On rare occasions, the saved document cannot be sent as an attachment to an email. (I attach the doc to an email but it is not received on the other end!)

I hope someone can figure this out!!