Hello I have this Megamenu extension which seems to work. In fact there is already one "BLOG" item in the menu.
When I try to add a category to the megamenu from the category the, fieldset referring to the megamenu opens, but quickly the items into it are removed (they are there when the page loads).
It seems to me this sort of behavior comes from an error, cause the pointer on the dropdown is red.
Since the image does not seem to load, here is a link.