Can't get rid of "this file contains links to other files."
I have a calc spreadsheet in which I made a link to an external file. I no longer need that link and cleared (deleted) the cell containing it. But I still get that message when I open the file! I have searched the entire file for "file" or "///" in formulas and can't find any other cell that I might have created that has such a reference. (The file has about 10 sheets in it and is pretty big, so it's not easy to search it manually.) I also tried "breaking" the link from the edit menu, but that did no good. Ideas anyone?
Make a copy of the file. Delete the sheets until the problem goes away. In this way you can probably pinpoint the problem faster.
I did that! I tried deleting (clearing) the contents of all spreadsheets and still got the message. See my answer below on what seems to be the underlying problem (track changes still remembers a link even if it's been deleted and the delete accepted!)