Hi Danny,
so what you’re saying is that the “woo headlines” theme is causing the conflict for the first site. If the hook is somehow also used or overridden by the theme, this can indeed cause problems. I’m willing to look into it later (don’t have much time this week) but I’m not sure if there’s anything I can do to solve it.
EDIT: The “woo headlines” theme does seem to manipulate the menu as well. So the conflict lies there, my plugin’s changes to the menu are discarded by or conflict with the theme, probably. I’ll look into it later to verify this.
As for the second link, note that it is not “order” or “order by” that determines the number of posts in the menu, but the “number of posts” field.
Kind regards,
Diana