Thanks Tim. I only have one map style set up at the moment (terrain) so I'm using the map ID of that in the Mapbox 1 input box. I was a bit confused at first as to what should be entered here and tried both my public and private api access tokens from Mapbox but that had the same result. I used the map ID instead after looking in the Plan-G manual where you showed an example and after reading the readme from the Plan-G install zip.