Hopefully someone will have a suggestion on this.  A user reports that
when they log onto root and: 

  crontab -e

Changes made, even simply changes such as to comments, are lost after
then exit the vi editor.  The message shows:

  crontab: no changes made to crontab

Logged on as root, I can edit the file, called
/var/spool/cron/tabs/root, using vi.  These changes are (not
surprisingly) accepted.  After making a change (adding a comment),
crontab -e shows the newly-updated file.  But I still cannot change it
(for example, remove my newly-added comment) with the vi ":wq" command.
If I use crontab -e to edit the file and ":w /root/asdf" I do see my
changes in file /root/asdf.  An lsattr command on the file in
/var/spool/cron/tabs/root shows no attributes set (all hyphens).  ls
shows the file is R/W to owner alone.  Even after I restart the server,
the problem persists.  The syntax of the existing cron file appears
correct, in that "it's five tokens, plus the command to run".  Even if I
remove all records (excepts comments), the "no changes" message still
occurs.

What gives?  

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