When you go to save a menu, a warning and fatal error occurs related to this plugin. This is because when you save a menu it’s like saving a post. So, I imagine this plugin is getting confused because something that looks like a post is updated but it’s not a post, it’s a menu.
target_core.php needs changes.
I have what I think are the correct changes if you want me to email my updated code to you. Or, share in some other way.
Finally, do you plan on maintaining this? It sounds like such a great idea! One major thing that is needed is an unsubscribe link in the emails.
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