I've downloaded a workbook from our server and made updates to it over the course of several days. When I published the updated workbook, all comments had disappeared.
I have downloaded and published updates many times before without losing comments. I did have a few more changes to make this time which took some more time, but nothing I can see would have any effect on the comments.
Any ideas what happened or how I can retrieve these? I have tried publishing backup versions with no luck.