When a certain user saves a file in Excel 2010, she gets a message: "The file <name of file> may have been changed by another user since you last saved it." She can choose to save as another file or overwrite with her changes. This just started happening a week or so ago. She was concerned that someone else was accessing her files, but we did several tests that opened, made a change and saved in a matter of seconds, and she still gets the message. It happens onmost files, but not all – both network and local.
We already tried the QFE_Saskatchewan registry fix. I also checked the file server for Services for Macintosh.