Update: after some digging, I found the problem is related to gnuplot.el.

As a workaround, I set gnuplot-insertions-menu-flag to nil and now
evaluation is working again.  I'm still not sure whether this is a gnuplot
mode bug or somehow related to the babel-gnuplot interface.

Tomas


On Mon, Mar 16, 2020 at 11:22 AM Tomas Grigera <tgrigera@gmail.com> wrote:

> Dear all,
>
> After upgrading org to 9.3.6-25  (Org mode version 9.3.6
> (9.3.6-25-g685b2c-elpa @ /home/tomas/.emacs.d/elpa/org-20200316/)  I get
> the following error when trying to evaluate gnuplot source blocks:
>
> easy-menu-convert-item-1: Invalid menu item in easymenu
>
> I use gnuplot snippets a lot in my org-mode files, and I am clueless as
> how to fix this.  Any fix / pointer / suggestion will be very appreciated.
>
> Thank you
>
> Tomas
>
>