Re: error tangling: how to debug please?

[Fraga, Eric]

Hi Ihor,

> I recommend setting org-element--cache-self-verify to 'backtrace and
> org-element--cache-self-verify-frequency to 1.0. Then, Org will
> self-check the cache consistency and generate a backtrace when a
> problem is detected.

I have set these and will let you know how I get on.  I have cleared the
whole cache to start from scratch...

Thank you for your help on this.
-- 
: Eric S Fraga, with org release_9.6.7-661-g34ee6f in Emacs 30.0.50