My computer crashed (yes, it does that from time to time...), and when everything was restored I noticed that a map came up as "checked out".
That was odd, because the first thing I do after a crash is to delete all the files in the local storage, and no information appeared for this map.
Anyway, I was able to check it in, but then unable to open or check it out. Just a message "...hexadecimal value 0x00 is an invalid character. Line 1 Position 1..."
So I restored from an older version. Did not help.
So I restored from an even older version. Did not help.
So I downloaded the map to my C-drive and checked the codes in Notepad. There were no hexadecimal value 0x00 at the top of the file. I then uploaded the map. Did not help.
In the end I had to create a new map. No big deal, but awkward because it is used in very many publications.
Does this sound familiar? What is wrong?