Hi Ihor,

With straight.el, it's Org mode version 9.5.3.

If I open the file with emacs -Q, I'm surprised to see that I get a
different warning message:

File mode specification error: (void-variable org-fold-core-style)

This is on emacs 28.1, which uses Org mode version 9.5.2

On Mon, May 30, 2022 at 10:09 PM Ihor Radchenko <yantar92@gmail.com> wrote:

> Scott Otterson <scotto@sharpleaf.org> writes:
>
> > Having just updated to emacs 28.1, I'm seeing the warning
> >
> > org-element--cache: Unregistered buffer
> >
> > every time I open a .org file.  I also notice that org-superstar no
> longer
> > works.
> >
> > These problems persist if I delete my .emacs.d and let straight.el
> rebuild
> > everything.
>
> Thanks for reporting! You appear to use straight.el. Can you please
> share the output of M-x org-version? straight.el is known to create
> problems when Org is loaded late in you config.
> See https://github.com/radian-software/straight.el/issues/947
>
> Also, can you try to open the problematic files using bare Emacs
> starting from emacs -Q? See https://orgmode.org/manual/Feedback.html
>
> Best,
> Ihor
>