Turns out that the issue was caused by trying to disable a flycheck checker
using the org edit src hook

On Mon, Dec 18, 2017, 6:30 AM Nicolas Goaziou <mail@nicolasgoaziou.fr>
wrote:

> Hello,
>
> Paul Davis <paul.dangersalad@gmail.com> writes:
>
> > Using ~C-c '~ to edit a src block works as expected, but if I make
> > changes and use ~C-c '~ again, I get the error ~Cannot modify an area
> > being edited in a dedicated buffer~
>
> I need more information. Where do you make changes? In the newly created
> buffer? Where do you call ~C-c '~?
>
> For example, I created the following buffer
>
>     #+begin_src emacs-lisp
>       (+ 1 2)
>     #+end_src
>
> moved on the source block, used C-c '. Then, in the new buffer,
> I replaced 2 with 3 and pressed C-c ' again, without any error?
>
> IOW, could you provide a precise recipe demonstrating the issue?
>
> Thank you.
>
> Regards,
>
> --
> Nicolas Goaziou
>