A user is able to open the file without it saying it is in read-only (it's not marked as read-only in the properties), but after they work on it and try to save it gives the read-only message ("We can't save 'filename.xlsx' because the file is read-only..." I've done some looking around, and tried turning off the preview pane and details pane, as well as disabling "Show pop-up description for folder and desktop items"
It's happening to multiple files, not just one. I haven't tried it on a word document, but the user said they didn't notice it.
I haven't been able to recreate the issue. They are running Excel 2013 on Windows 10. Any ideas?