Category selection is using radio buttons as selection type!
I've been adding some categories and noticed that they are appearing as radio buttons and not checkboxes.
Radio buttons are not appropriate as a selection type for a hierarchical structure where you need to apply more than one category.
I've looked through the settings but cannot see any provision to change category selection to checkboxes.
However, when I add a new category in the listing screen it appears as a pre-checked checkbox. But when I update the listing the checkbox turns into a radio button and obviously I can't add the listing to several categories.
In the listing screen the category meta box show radio button selection type in the 'All Categories' tab, but in the 'Most Used' tab they appear as checkboxes.