Because my previous topic about the Link Manager is closed I open a new one.
The + Add New Category link is dead, does nothing. It’s similar to the one in the post editor.
Was not able to find the cause yet. I thought it was because no jQuery core was loaded in the footer of the link editor (unlike the post editor), but after adding this it still does not work.
I don’t see an Add New Category link. I see an Add New link, which is for creating a new link, and a Link Categories link, where you can add and manage your link categories.
I’ve tested in core, I presume we are talking about the Link > Add New page and then in the Category meta box there is a link called “+ Add New Category”.
For me, clicking that link expands a dialog area, so I suspect a Javascript conflict is at play.