Colin Baxter 😺 <m43cap@yandex.com> writes:

>     > Hello, Whenever I archive a DONE item via 'C-c C-x C-a' I get the
>     > warning:
>
>     > Warning (emacs): org-element--cache: Unregistered buffer
>     > modifications detected. Resetting.
>
>     > The archiving is successful, but I keep getting the warning and
>     > therefore wonder if there is some org-persist or cache setting
>     > that needs to be adjusted.
>
> Thinking a little more about this, I have not yet had a chance of
> archiving an item in a new emacs session. It may be that the warning
> is temporary to the first session and will disappear if and when I
> archive a DONE item in a new session.

This message always indicates some problem. However, I cannot reproduce
what you observe on my side. Did you try with emacs -Q? Also, you might
not be running the latest Org. I have extended this warning in recent
commits.

My crystal ball tells me that the attached patch might help. Can you try
it?

Best,
Ihor