Hi Paulo,
Thanks very much for your help. Changing Genre to checkboxes is exactly what I did, so it sounds as though that was indeed the problem.
One more question…
I have now set up Venues as a custom post type, which makes more sense as a title for the listings for this particular site. I don’t intend to use the Places CPT as all the listings will be venues anyway. For this reason I have been trying to hide the post type Places and all its categories from the homepage map widget under the Map tab, so that site users don’t get confused (if they were to click on the Places tab by mistake, no listings would be returned). However, when I tick the Places checkbox and try to Save, it also disables/hides all but one of the Venue categories too. Is there any way around this?
Thanks for your help 🙂